staging: v0.20.0 Breaking Changes

[aklinker1]

This PR will be rebased onto main once v0.20.0 is ready to be released. It contains all the breaking changes queued up for that release. No ETA for when this version will be released.

The goal is for this to be the last round of breaking changes before v1.0 is released.

• feat!: Remove webextension-polyfill #1084 closes [Experimental Feedback] Exclude webextension-polyfill via extensionApi: "chrome" #868
• fix!: Add suffix to non-production output directories #1086 closes Separate the dev and production outputs #1010
• fix!: Remove deprecated jiti entrypoint loader #1087
• fix!: Rename runner to webExt #1180
• fix!: Remove transformManfiest option #1181
• feat: Upgrade to c12@2 so config is loaded as ESM #1182 closes Load wxt.config.ts as ESM #297
• Don't require matches for content scripts
• Apply CSS reset inside shadow roots #1195
• Spike out vite 6 changes
• Add upgrade docs for breaking changes listed above

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commit: 7c693e8

[codecov]

Codecov Report

Attention: Patch coverage is 96.47059% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.16%. Comparing base (842c158) to head (7c693e8).

Files with missing lines	Patch %	Lines
...src/core/builders/vite/plugins/extensionApiMock.ts	0.00%	1 Missing ⚠️
packages/wxt/src/core/utils/content-scripts.ts	66.66%	1 Missing ⚠️
...es/wxt/src/virtual/utils/reload-content-scripts.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1085      +/-   ##
==========================================
- Coverage   82.07%   81.16%   -0.92%     
==========================================
  Files         127      124       -3     
  Lines        6661     6519     -142     
  Branches     1112     1088      -24     
==========================================
- Hits         5467     5291     -176     
- Misses       1180     1211      +31     
- Partials       14       17       +3     

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