[16.0][FIX] project_timeline: Fix demo task dates

[houzefa-abba]

This commit fixes inconsistent dates we get when building a demo DB.

This module adds a date_start field; this is the one we want to fill in demo data.
We do not want to fill date_assign, which is an automatic field.

This is how this module used to work in v12 (was based on date_start).

• v12➔v13 MIG: Odoo removed the base date_start field so date_start was changed to date_assign in this module.
• v13➔v14 MIG: date_start was added back into this module to restore v12 behavior. However, demo data then got left untouched.

Related to OCA/web#2774

Before

# select id, name, date_start, date_end, date_assign from project_task order by id;
 id |                 name                  |     date_start      |      date_end       |     date_assign     
----+---------------------------------------+---------------------+---------------------+---------------------
  1 | Office planning                       |                     | 2024-05-08 00:00:00 | 2024-05-03 00:00:00
  2 | Lunch Room: kitchen                   | 2024-04-03 09:39:21 | 2024-04-04 00:00:00 | 2024-04-02 00:00:00
  3 | Noise Reduction                       | 2024-04-03 09:39:21 | 2024-04-04 00:00:00 | 2024-04-01 00:00:00
  4 | Modifications asked by the customer   |                     | 2024-05-05 00:00:00 | 2024-05-03 00:00:00
  5 | Energy Certificate                    | 2024-04-03 09:39:21 | 2024-03-31 00:00:00 | 2024-03-28 00:00:00
  6 | Room 1: Decoration                    | 2024-04-03 09:39:21 | 2024-04-01 00:00:00 | 2024-03-25 00:00:00
  7 | Room 2: Decoration                    | 2024-04-03 09:39:22 | 2024-04-01 00:00:00 | 2024-03-27 00:00:00
  8 | Black Chairs for managers             | 2024-04-03 09:39:22 | 2024-03-28 00:00:00 | 2024-03-24 00:00:00
  9 | Meeting Room Furnitures               | 2024-04-03 09:39:22 | 2024-03-28 00:00:00 | 2024-03-21 00:00:00
 10 | Customer review                       |                     |                     | 
 11 | Daily stand-up meeting - Send minutes |                     |                     | 
 12 | Customer Meeting                      |                     |                     | 
 13 | Daily Meetings summary                |                     |                     | 
 14 | Preparation                           |                     |                     | 
 15 | Minutes                               |                     |                     | 
 16 | Customer analysis + Architecture      | 2024-04-03 09:39:22 | 2024-04-25 00:00:00 | 2024-04-23 00:00:00
 17 | Basic outline                         | 2024-04-03 09:39:22 | 2024-04-13 00:00:00 | 2024-04-04 00:00:00
 18 | Planning and budget                   | 2024-04-03 09:39:22 | 2024-04-23 00:00:00 | 2024-04-04 00:00:00
 19 | User interface improvements           | 2024-04-03 09:39:22 | 2024-04-26 00:00:00 | 2024-04-16 00:00:00
 20 | Social network integration            | 2024-04-03 09:39:22 | 2024-04-26 00:00:00 | 2024-04-16 00:00:00
 21 | Create new components                 |                     | 2024-04-18 00:00:00 | 2024-04-14 00:00:00
 22 | New portal system                     | 2024-04-03 09:39:22 | 2024-04-13 00:00:00 | 2024-04-02 00:00:00
 23 | Usability review                      | 2024-04-03 09:39:22 | 2024-04-23 00:00:00 | 2024-04-15 00:00:00
 24 | Document management                   | 2024-04-03 09:39:23 | 2024-04-09 00:00:00 | 2024-04-02 00:00:00
 25 | Unit Testing                          |                     | 2024-05-23 00:00:00 | 2024-04-23 00:00:00
 26 | Code Documentation                    | 2024-04-03 09:39:23 | 2024-04-03 09:39:23 | 2024-04-03 09:39:23
 27 | Entry Hall                            | 2024-04-03 09:39:23 | 2024-04-03 09:39:23 | 2024-04-03 09:39:23
 28 | Check Lift                            | 2024-04-03 09:39:23 | 2024-04-03 09:39:23 | 2024-04-03 09:39:23
 29 | Room 1: Paint                         | 2024-04-03 09:39:23 | 2024-04-03 09:39:23 | 2024-04-03 09:39:23
 30 | Bathroom                              | 2024-04-03 09:39:23 | 2024-04-03 09:39:23 | 2024-04-03 09:39:23
 31 | Room 2: Paint                         | 2024-04-03 09:39:23 | 2024-04-03 09:39:23 | 2024-04-03 09:39:23
 32 | Buy a gift for Marc Demo's birthday   | 2024-04-03 09:39:23 |                     | 2024-04-03 09:39:23
 33 | Change left screen cable              | 2024-04-03 09:39:23 |                     | 2024-04-03 09:39:23
 34 | Clean kitchen fridge                  | 2024-04-03 09:39:23 |                     | 2024-04-03 09:39:23
 35 | Check employees lunch accounts        | 2024-04-03 09:39:23 |                     | 2024-04-03 09:39:23
(35 rows)

After

# select id, name, date_start, date_end, date_assign from project_task order by id;
 id |                 name                  |     date_start      |      date_end       |     date_assign     
----+---------------------------------------+---------------------+---------------------+---------------------
  1 | Office planning                       | 2024-05-03 00:00:00 | 2024-05-08 00:00:00 | 
  2 | Lunch Room: kitchen                   | 2024-04-02 00:00:00 | 2024-04-04 00:00:00 | 2024-04-03 13:09:25
  3 | Noise Reduction                       | 2024-04-01 00:00:00 | 2024-04-04 00:00:00 | 2024-04-03 13:09:25
  4 | Modifications asked by the customer   | 2024-05-03 00:00:00 | 2024-05-05 00:00:00 | 
  5 | Energy Certificate                    | 2024-03-28 00:00:00 | 2024-03-31 00:00:00 | 2024-04-03 13:09:25
  6 | Room 1: Decoration                    | 2024-03-25 00:00:00 | 2024-04-01 00:00:00 | 2024-04-03 13:09:25
  7 | Room 2: Decoration                    | 2024-03-27 00:00:00 | 2024-04-01 00:00:00 | 2024-04-03 13:09:25
  8 | Black Chairs for managers             | 2024-03-24 00:00:00 | 2024-03-28 00:00:00 | 2024-04-03 13:09:25
  9 | Meeting Room Furnitures               | 2024-03-21 00:00:00 | 2024-03-28 00:00:00 | 2024-04-03 13:09:25
 10 | Customer review                       |                     |                     | 
 11 | Daily stand-up meeting - Send minutes |                     |                     | 
 12 | Customer Meeting                      |                     |                     | 
 13 | Daily Meetings summary                |                     |                     | 
 14 | Preparation                           |                     |                     | 
 15 | Minutes                               |                     |                     | 
 16 | Customer analysis + Architecture      | 2024-04-23 00:00:00 | 2024-04-25 00:00:00 | 2024-04-03 13:09:26
 17 | Basic outline                         | 2024-04-04 00:00:00 | 2024-04-13 00:00:00 | 2024-04-03 13:09:26
 18 | Planning and budget                   | 2024-04-04 00:00:00 | 2024-04-23 00:00:00 | 2024-04-03 13:09:26
 19 | User interface improvements           | 2024-04-16 00:00:00 | 2024-04-26 00:00:00 | 2024-04-03 13:09:26
 20 | Social network integration            | 2024-04-16 00:00:00 | 2024-04-26 00:00:00 | 2024-04-03 13:09:26
 21 | Create new components                 | 2024-04-14 00:00:00 | 2024-04-18 00:00:00 | 
 22 | New portal system                     | 2024-04-02 00:00:00 | 2024-04-13 00:00:00 | 2024-04-03 13:09:26
 23 | Usability review                      | 2024-04-15 00:00:00 | 2024-04-23 00:00:00 | 2024-04-03 13:09:26
 24 | Document management                   | 2024-04-02 00:00:00 | 2024-04-09 00:00:00 | 2024-04-03 13:09:26
 25 | Unit Testing                          | 2024-04-23 00:00:00 | 2024-05-23 00:00:00 | 
 26 | Code Documentation                    | 2024-04-03 13:09:26 | 2024-04-03 13:09:26 | 2024-04-03 13:09:26
 27 | Entry Hall                            | 2024-04-03 13:09:26 | 2024-04-03 13:09:26 | 2024-04-03 13:09:26
 28 | Check Lift                            | 2024-04-03 13:09:26 | 2024-04-03 13:09:26 | 2024-04-03 13:09:26
 29 | Room 1: Paint                         | 2024-04-03 13:09:27 | 2024-04-03 13:09:27 | 2024-04-03 13:09:27
 30 | Bathroom                              | 2024-04-03 13:09:27 | 2024-04-03 13:09:27 | 2024-04-03 13:09:27
 31 | Room 2: Paint                         | 2024-04-03 13:09:27 | 2024-04-03 13:09:27 | 2024-04-03 13:09:27
 32 | Buy a gift for Marc Demo's birthday   | 2024-04-03 13:09:27 |                     | 2024-04-03 13:09:27
 33 | Change left screen cable              | 2024-04-04 22:00:00 | 2024-04-04 22:00:00 | 2024-04-03 13:09:27
 34 | Clean kitchen fridge                  | 2024-04-03 13:09:27 |                     | 2024-04-03 13:09:27
 35 | Check employees lunch accounts        | 2024-04-03 13:09:27 |                     | 2024-04-03 13:09:27
(35 rows)

[pedrobaeza]

/ocabot merge minor

[OCA-git-bot]

What a great day to merge this nice PR. Let's do it!
Prepared branch 16.0-ocabot-merge-pr-1259-by-pedrobaeza-bump-minor, awaiting test results.

[OCA-git-bot]

Congratulations, your PR was merged at d7f0851. Thanks a lot for contributing to OCA. ❤️