fix(dashboard): fix default filter bar visibility + add docs

[villebro]

SUMMARY

This adds docs for reserved/supported URL parameters in the dashboard view. While writing docs for the Dashboard URL params, I noticed some inconsistencies in how they work:

• The return type for getUrlParam was missing null which it defaults to when the param is missing
• There was no way to disable native filters via URL params the same way that the dashboard metadata flag show_native_filters does. Here we recycle the show_filters URL param to mimic the behavior of show_native_filters.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

1. Go to a dashboard with no native filters and set expand_filters=1 on the URL to forcefully expand the Filter Bar: http://35.86.100.235:8080/superset/dashboard/10/?expand_filters=1
2. Go to a dashboard with at least 1 native filter and set expand_filters=0 on the URL to forcefully collapse the Filter Bar: http://35.86.100.235:8080/superset/dashboard/10/?expand_filters=0
3. Go to a dashboard and set show_filters=0 to forcefully disable native filters (handy for standalone mode): http://35.86.100.235:8080/superset/dashboard/10/?show_filters=0
4. Go to the "Video Game Sales" dashboard and set standalone=0 to verify that it looks like the default configuration: http://35.86.100.235:8080/superset/dashboard/5/?standalone=0
5. Set standalone=1 to see that the top nav is removed: http://35.86.100.235:8080/superset/dashboard/5/?standalone=1
6. Set standalone=2 to see that the top nav + title is removed: http://35.86.100.235:8080/superset/dashboard/5/?standalone=2
7. Set standalone=3 to see that the top nav + title + top tabs are removed: http://35.86.100.235:8080/superset/dashboard/5/?standalone=3
8. Set standalone=3&show_filters=0 to make sure filter bar, nav, title and top tabs are removed: http://35.86.100.235:8080/superset/dashboard/5/?standalone=3&show_filters=0

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 #18741 (84b1ae1) into master (f9feb1b) will decrease coverage by 0.07%.
The diff coverage is 71.42%.

❗ Current head 84b1ae1 differs from pull request most recent head 7ae3735. Consider uploading reports for the commit 7ae3735 to get more accurate results

@@            Coverage Diff             @@
##           master   #18741      +/-   ##
==========================================
- Coverage   66.64%   66.57%   -0.08%     
==========================================
  Files        1670     1667       -3     
  Lines       64590    64419     -171     
  Branches     6506     6505       -1     
==========================================
- Hits        43047    42887     -160     
+ Misses      19860    19849      -11     
  Partials     1683     1683              

Flag	Coverage Δ
javascript	51.36% <71.42%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
...-frontend/src/components/UiConfigContext/index.tsx	50.00% <0.00%> (ø)
...d/components/DashboardBuilder/DashboardBuilder.tsx	72.72% <ø> (ø)
superset-frontend/src/utils/urlUtils.ts	36.73% <ø> (ø)
...src/dashboard/components/DashboardBuilder/state.ts	70.00% <80.00%> (+1.03%)	⬆️
...rd/components/nativeFilters/FilterBar/keyValue.tsx	33.33% <100.00%> (ø)
superset/utils/cache_manager.py	93.75% <0.00%> (-6.25%)	⬇️
superset/key_value/commands/create.py	89.47% <0.00%> (-4.41%)	⬇️
...perset-frontend/src/views/components/MenuRight.tsx	65.71% <0.00%> (-1.98%)	⬇️
...tend/src/views/CRUD/data/database/DatabaseList.tsx	65.47% <0.00%> (-1.92%)	⬇️
superset-frontend/src/views/components/Menu.tsx	58.97% <0.00%> (-1.03%)	⬇️
... and 29 more

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[villebro]

/testenv up

[github-actions]

@villebro Ephemeral environment spinning up at http://35.86.100.235:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[kgabryje]

Tested many combinations of standalone, show filters, expand filters, couldn't break anything. LGTM!

[jinghua-qa]

LGTM!

[villebro]

Thanks @kgabryje and @jinghua-qa for review/testing!

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.