#9429 Initializing npm workspace for extension application

[fungairino]

What does this PR do?

• Closes Slice 1: Set up initial npm workspace and directory structure #9429
• Moving pixiebrix extension to a npm workspace under /applications/browser-extension
• Storybook was tested locally and it works.
• Root package.json created (named "@pixiebrix/source")
• Knip is temporarily removed since it requires more work to set up and run from the root.

Discussion

• PR Vendors check failing is expected since these files were moved

Checklist

• Verify pinning this change to the app
• Fix coverage generation / uploading
• Figure out why vercel deployment is failing

For more information on our expectations for the PR process, see the
code review principles doc

[github-actions]

Playwright test results

 150 passed
 4 flaky
 2 skipped

Details

 Open report ↗︎
 156 tests across 51 suites
 11 minutes, 40 seconds
 7eb722f
 For more information on how to debug and view this report, see our readme

Flaky tests

chrome-setup › setup/unaffiliated.setup.ts › authenticate with unaffiliated user
chrome › tests/pageEditor/brickActions.spec.ts › brick actions panel behavior
msedge › tests/pageEditor/copyMod.spec.ts › run a copied mod with a built-in integration
msedge › tests/runtime/sidebar/sidebarNavigation.spec.ts › sidebar form and temporary panels are unavailable after navigation

Skipped tests

chrome › tests/runtime/googleSheetsIntegration.spec.ts › can activate a google spreadsheet mod with config options
msedge › tests/runtime/googleSheetsIntegration.spec.ts › can activate a google spreadsheet mod with config options

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.68%. Comparing base (8318d74) to head (7eb722f).
Report is 479 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9444      +/-   ##
==========================================
+ Coverage   74.24%   75.68%   +1.43%     
==========================================
  Files        1332     1406      +74     
  Lines       40817    42418    +1601     
  Branches     7634     7813     +179     
==========================================
+ Hits        30306    32102    +1796     
+ Misses      10511    10316     -195     

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[fungairino]

I confirmed we can install this version of the extension in the app using gitpkg like so:

"@pixiebrix/extension": "https://gitpkg.vercel.app/pixiebrix/pixiebrix-extension/applications/browser-extension?810302c4a83786324c5179b46bcad6eac4e23b41",

[github-actions]

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