feat: add export_related flag

[betodealmeida]

SUMMARY

This PR introduces a new flag export_related to the export commands (databases, datasets, charts, dashboards, saved queries). Usually, when a dataset is exported it will also export its database; when a dashboard is exported, the export will also contain associated charts, datasets, and databases; and so on. When the flag is changed from its default value of True then only the asset itself will be exported, without any associated assets.

This PR is in preparation for creating a command that will export all assets from a given Superset workspace, allowing us to move the configuration to source control.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

Added unit tests for each of the models.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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 #19215 (5d326a3) into master (bb618a4) will decrease coverage by 0.02%.
The diff coverage is 85.00%.

❗ Current head 5d326a3 differs from pull request most recent head 91e9831. Consider uploading reports for the commit 91e9831 to get more accurate results

@@            Coverage Diff             @@
##           master   #19215      +/-   ##
==========================================
- Coverage   66.55%   66.53%   -0.03%     
==========================================
  Files        1646     1646              
  Lines       63632    63637       +5     
  Branches     6476     6476              
==========================================
- Hits        42353    42341      -12     
- Misses      19597    19614      +17     
  Partials     1682     1682              

Flag	Coverage Δ
hive	52.52% <26.41%> (-0.02%)	⬇️
mysql	81.87% <88.67%> (-0.01%)	⬇️
postgres	?
presto	52.36% <26.41%> (-0.02%)	⬇️
python	82.30% <88.67%> (-0.06%)	⬇️
sqlite	81.67% <88.67%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset-frontend/src/views/CRUD/utils.tsx	62.71% <0.00%> (ø)
superset-frontend/src/views/components/Menu.tsx	58.97% <ø> (ø)
...perset-frontend/src/views/components/MenuRight.tsx	65.71% <0.00%> (ø)
superset/dashboards/commands/export.py	84.93% <71.42%> (-0.99%)	⬇️
...frontend/src/components/TimezoneSelector/index.tsx	93.93% <80.00%> (ø)
superset/datasets/commands/export.py	87.75% <84.61%> (+0.25%)	⬆️
superset/queries/saved_queries/commands/export.py	94.44% <84.61%> (+0.15%)	⬆️
superset/charts/commands/export.py	94.11% <100.00%> (ø)
superset/commands/export/models.py	96.96% <100.00%> (ø)
superset/databases/commands/export.py	91.48% <100.00%> (+0.18%)	⬆️
... and 11 more

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[hughhhh]

nit: i like export_dependencies instead of related

[betodealmeida]

I used related to keep the same terminology used by FAB, and also because some of these are not technically dependencies (eg, when we export a database you also get the datasets, though they're not dependencies).

[hughhhh]

LGTM