feat: migration to add timezone to report schedule

[eschutho]

SUMMARY

Adds timezone to report schedule db in order to allow us to add a UI on the reports for users to select a timezone for their schedule. Timezones are strings of locations, such as "America/Los_Angeles" or "UTC".

The default value of UTC as an example will be GMT, which is the current +0 offset time that we are using.

In the future UI, the plan is to "guess" the user's timezone and default the selection to their current timezone.

For context, the full PR is https://github.com/apache/superset/pull/15743/files

TESTING INSTRUCTIONS

results of db migration script:

Current: 0.33 s
10+: 0.34 s
100+: 0.32 s
1000+: 0.33 s

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #15747 (9ad8a01) into master (fefcea7) will decrease coverage by 0.22%.
The diff coverage is n/a.

❗ Current head 9ad8a01 differs from pull request most recent head f081ddd. Consider uploading reports for the commit f081ddd to get more accurate results

@@            Coverage Diff             @@
##           master   #15747      +/-   ##
==========================================
- Coverage   77.13%   76.90%   -0.23%     
==========================================
  Files         984      984              
  Lines       51677    51677              
  Branches     6995     6995              
==========================================
- Hits        39860    39742     -118     
- Misses      11593    11711     +118     
  Partials      224      224              

Flag	Coverage Δ
hive	?
mysql	81.54% <ø> (ø)
postgres	81.56% <ø> (+<0.01%)	⬆️
presto	?
python	81.65% <ø> (-0.45%)	⬇️
sqlite	81.19% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.44% <0.00%> (-17.07%)	⬇️
superset/db_engine_specs/presto.py	83.36% <0.00%> (-6.95%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/connectors/sqla/models.py	88.31% <0.00%> (-1.64%)	⬇️
superset/db_engine_specs/base.py	88.28% <0.00%> (-0.40%)	⬇️
superset/models/core.py	89.61% <0.00%> (-0.26%)	⬇️
superset/utils/core.py	88.12% <0.00%> (-0.13%)	⬇️

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[eschutho]

thanks @betodealmeida

[eschutho]

The failing test is at ERROR at setup of TestImportExport.test_import_2_slices_for_same_table ____

[github-actions]

⚠️ @eschutho Your base branch master has just also updated superset/migrations.

❗ Please consider rebasing your branch to avoid db migration conflicts.

[github-actions]

⚠️ @eschutho Your base branch master has just also updated superset/migrations.

❗ Please consider rebasing your branch to avoid db migration conflicts.

[github-actions]

⚠️ @eschutho Your base branch master has just also updated superset/migrations.

❗ Please consider rebasing your branch to avoid db migration conflicts.

[github-actions]

⚠️ @eschutho Your base branch master has just also updated superset/migrations.

❗ Please consider rebasing your branch to avoid db migration conflicts.