Remove bootstrap and enable tailwind preflight #35876

Job	Run time
Check PR run / Check	3s
Setup	4s
Locales Test	7s
Build Safari	16m 28s
Build browser source	12s
Build (chrome, dist:chrome, dist-chrome.zip, dist-chrome-MV3)	10m 39s
Build (edge, dist:edge, dist-edge.zip, dist-edge-MV3)	10m 21s
Build (firefox, dist:firefox, dist-firefox.zip, dist-firefox)	6m 15s
Build (firefox-mv3, dist:firefox:mv3, dist-firefox.zip, DO-NOT-USE-FOR-PROD-dist-firefox-MV3)	10m 43s
Build (opera, dist:opera, dist-opera.zip, dist-opera)	6m 42s
Build (opera-mv3, dist:opera:mv3, dist-opera.zip, DO-NOT-USE-FOR-PROD-dist-opera-MV3)	11m 10s
Crowdin Push	0s
Check for failures	14s
	1h 12m 58s

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