27209 [web] Clean up librarified files (cla: yes, platform-web)

27232 [web] Librarify html renderer files (cla: yes, waiting for tree to go green, platform-web)

27264 Fix prebuilt Dart SDK use on Windows (cla: yes, platform-web)

27294 Dispose of embedded views in CanvasKit after resize (cla: yes, platform-web)

27296 [web] Librarify all remaining files (cla: yes, platform-web, needs tests)

27299 [web] delete e2etests and all related tooling (cla: yes, platform-web)

27329 [web] remove no longer used setFilterQuality (cla: yes, platform-web)