#9105: move state controller to content script

[twschiller]

What does this PR do?

• Part of [Spike] POC of mod variable syncing #9105
• Move state controller to content script folder in anticipation of content script-specific logic coming out of #9105: POC of mod variable sync #9106

Discussion

• Tests use the content script platform by default

Future Work

• Make get/set async

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[github-actions]

Playwright test results

 124 passed
 2 flaky
 6 skipped

Details

 Open report ↗︎
 132 tests across 44 suites
 11 minutes, 23 seconds
 23e04ed
 For more information on how to debug and view this report, see our readme

Flaky tests

chrome › tests/pageEditor/addStarterBrick.spec.ts › Add starter brick to mod
msedge › tests/pageEditor/addStarterBrick.spec.ts › Add starter brick to mod

Skipped tests

chrome › tests/regressions/doNotCloseSidebarOnPageEditorSave.spec.ts › #8104: Do not automatically close the sidebar when saving in the Page Editor
msedge › tests/regressions/doNotCloseSidebarOnPageEditorSave.spec.ts › #8104: Do not automatically close the sidebar when saving in the Page Editor
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
chrome › tests/runtime/insertAtCursor.spec.ts › Insert at Cursor › 8154: can insert at cursor after opening sidebar from selection menu
msedge › tests/runtime/insertAtCursor.spec.ts › Insert at Cursor › 8154: can insert at cursor after opening sidebar from selection menu

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.74%. Comparing base (8318d74) to head (23e04ed).
Report is 264 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9120      +/-   ##
==========================================
+ Coverage   74.24%   74.74%   +0.49%     
==========================================
  Files        1332     1345      +13     
  Lines       40817    41666     +849     
  Branches     7634     7755     +121     
==========================================
+ Hits        30306    31142     +836     
- Misses      10511    10524      +13     

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