Update navigation on Explore Extensions page

[witoszekdev]

Scope of the change

Added new navigation on Explore Extensions page with links to "Add custom extension" and "Install extensions from manifest"

Tip

This change is behind a dev feature flag. Enable it with:

localStorage.setItem('FF_extensions_dev', '{"enabled":true,"payload":"default"}')

[changeset-bot]

⚠️ No Changeset found

Latest commit: 965a54c

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.

Project coverage is 64.15%. Comparing base (6df91ff) to head (965a54c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...Extensions/components/ExploreExtensionsActions.tsx	92.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5577      +/-   ##
==========================================
+ Coverage   64.10%   64.15%   +0.05%     
==========================================
  Files        1386     1388       +2     
  Lines       23909    23937      +28     
  Branches     4743     4916     +173     
==========================================
+ Hits        15326    15356      +30     
+ Misses       8546     8544       -2     
  Partials       37       37              

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[github-actions]

merge-reports: Run #5526

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Pending ⏳	Other ❓	Flaky 🍂	Duration ⏱️
247	247	0	0	0	0	0	5m38s

🎉 All tests passed!

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