chore: freeze the UUID of examples DB

[betodealmeida]

SUMMARY

Currently when we run load-examples the examples DB is created with a random UUID. This makes it hard to move across instances datasets/charts/dashboards that reference the examples DB, since the UUID doesn't match.

This PR freezes the UUID of the examples DB.

There's one gotcha. If the user has created the examples DB before this PR, but runs load-examples after this patch we won't find the examples DB by searching for the frozen UUID. Instead, we need to search by name. This is how currently the load-examples process works. I kept the logic for when we can't find the examples DB via the UUID.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Loaded examples:

$ superset load-examples

Then checked the UUID of the examples DB created:

mysql> SELECT uuid FROM dbs;
+------------------------------------+
| uuid                               |
+------------------------------------+
| 0xA2DC77AFE65449BBB32140F6B559A1EE |
+------------------------------------+
1 row in set (0.00 sec)

mysql>

TESTING INSTRUCTIONS

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

[betodealmeida]

Other datasets inside superset/examples/configs/datasets/examples already had the UUID set to this, so I kept it and updated this one.

[codecov]

Codecov Report

Merging #15724 (05e82a9) into master (7dd3af6) will increase coverage by 0.02%.
The diff coverage is 71.22%.

❗ Current head 05e82a9 differs from pull request most recent head 83e6e0c. Consider uploading reports for the commit 83e6e0c to get more accurate results

@@            Coverage Diff             @@
##           master   #15724      +/-   ##
==========================================
+ Coverage   76.91%   76.94%   +0.02%     
==========================================
  Files         983      983              
  Lines       51583    51641      +58     
  Branches     6979     6994      +15     
==========================================
+ Hits        39673    39733      +60     
+ Misses      11688    11682       -6     
- Partials      222      226       +4     

Flag	Coverage Δ
hive	?
mysql	81.53% <71.87%> (+<0.01%)	⬆️
postgres	81.56% <71.87%> (+<0.01%)	⬆️
presto	81.26% <71.87%> (-0.01%)	⬇️
python	81.82% <71.87%> (-0.27%)	⬇️
sqlite	81.17% <71.87%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...set-frontend/src/dashboard/util/resizableConfig.ts	100.00% <ø> (ø)
...tasourcePanel/DatasourcePanelDragWrapper/index.tsx	100.00% <ø> (ø)
...onalFormattingControl/FormattingPopoverContent.tsx	33.33% <ø> (ø)
...ontrols/DndColumnSelectControl/DndMetricSelect.tsx	44.44% <0.00%> (ø)
...c/views/CRUD/data/database/DatabaseModal/index.tsx	47.57% <0.00%> (ø)
...nd/src/views/CRUD/data/dataset/AddDatasetModal.tsx	56.25% <ø> (ø)
superset/commands/importers/v1/examples.py	38.57% <0.00%> (-2.34%)	⬇️
...nts/controls/DateFilterControl/DateFilterLabel.tsx	66.93% <40.00%> (ø)
...et-frontend/src/components/TableSelector/index.tsx	84.25% <50.00%> (-0.79%)	⬇️
superset/utils/mock_data.py	25.18% <50.00%> (+0.36%)	⬆️
... and 31 more

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