Clean up CSS classes that aren't tailwind-compatible #35258

Job	Run time
Check PR run / Check	4s
Setup	5s
Locales Test	6s
Build browser source	9s
Build Safari	11m 5s
Build (chrome, dist:chrome, dist-chrome.zip, dist-chrome-MV3)	11m 11s
Build (edge, dist:edge, dist-edge.zip, dist-edge-MV3)	11m 25s
Build (firefox, dist:firefox, dist-firefox.zip, dist-firefox)	6m 26s
Build (firefox-mv3, dist:firefox:mv3, dist-firefox.zip, DO-NOT-USE-FOR-PROD-dist-firefox-MV3)	10m 35s
Build (opera, dist:opera, dist-opera.zip, dist-opera-MV3)	10m 34s
Crowdin Push	0s
Check for failures	26s
	1h 2m 6s

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