Drop inline panel starter brick

[twschiller]

What does this PR do?

• Drops inline panel starter brick and related code
• Where applicable, tests switched to using Sidebar Panel

Reviewer Notes

• Is a backward incompatible change. There's no production usage of inline panels. Inline panels were never made GA because: 1) point and click insertion was hard to get working, 2) rendering issues on some sites depending on front-end framework (including rendering infinite loops), 3) most users preferred sidebar due to interfaces already being cluttered

Remaining Work

• Fix flaky Jest snapshot test. (Snapshots contains some sequence numbers)

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

[github-actions]

Playwright test results

 80 passed
 2 skipped

Details

 Open report ↗︎
 82 tests across 29 suites
 34 minutes, 34 seconds
 f0460a5

Skipped tests

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

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.07%. Comparing base (c32e86f) to head (f0460a5).
Report is 60 commits behind head on main.

Files	Patch %	Lines
src/pageEditor/panes/insert/useAutoInsert.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8723      +/-   ##
==========================================
+ Coverage   73.69%   74.07%   +0.37%     
==========================================
  Files        1344     1342       -2     
  Lines       41566    41388     -178     
  Branches     7775     7754      -21     
==========================================
+ Hits        30633    30659      +26     
+ Misses      10933    10729     -204     

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[github-actions]

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