feat: Add 3 new extension points for inserting custom icons

[jfrag1]

SUMMARY

Preset would like to include custom icons in these three components. This PR introduces three new keys to the extensions registry to support this.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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

[diegomedina248]

Do we want to be this specific, or could we use an extension for the whole item, passing down the text instead?

[jfrag1]

I'm not sure here. On one hand having the extension be a whole replacement would allow for much more flexibility for anyone looking to use it. On the other hand, having it be specific provides one rigid supported pattern for the extension, which could be seen as a benefit.

[codecov]

Codecov Report

Merging #22027 (b8f0160) into master (792820e) will increase coverage by 0.00%.
The diff coverage is 60.00%.

@@           Coverage Diff            @@
##           master   #22027    +/-   ##
========================================
  Coverage   66.90%   66.91%            
========================================
  Files        1807     1813     +6     
  Lines       69183    69406   +223     
  Branches     7405     7482    +77     
========================================
+ Hits        46288    46444   +156     
- Misses      20985    21029    +44     
- Partials     1910     1933    +23     

Flag	Coverage Δ
javascript	53.46% <60.00%> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
...set-ui-core/src/ui-overrides/ExtensionsRegistry.ts	100.00% <ø> (ø)
...perset-frontend/src/views/components/RightMenu.tsx	78.23% <50.00%> (-0.25%)	⬇️
...ponents/ReportModal/HeaderReportDropdown/index.tsx	67.50% <60.00%> (-0.50%)	⬇️
...perset-frontend/src/views/CRUD/alert/AlertList.tsx	59.64% <66.66%> (+0.01%)	⬆️
superset-frontend/src/components/Select/styles.tsx	81.81% <0.00%> (-18.19%)	⬇️
...t-ui-chart-controls/src/shared-controls/mixins.tsx	16.66% <0.00%> (-16.67%)	⬇️
...perset-ui-chart-controls/src/sections/sections.tsx	71.42% <0.00%> (-16.08%)	⬇️
...ashboard/components/BuilderComponentPane/index.tsx	66.66% <0.00%> (-9.81%)	⬇️
...l/AdhocFilterEditPopoverSimpleTabContent/index.tsx	62.73% <0.00%> (-6.29%)	⬇️
...d/src/SqlLab/components/TabbedSqlEditors/index.jsx	49.03% <0.00%> (-5.67%)	⬇️
... and 84 more

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