fix(@angular/build): prevent nested CSS in components #7676

Job	Run time
lint	1m 58s
build	3m 29s
e2e_windows (windows-2025, 22, npm, 1)	39m 26s
e2e_windows (windows-2025, 22, npm, 2)	29m 45s
e2e_windows (windows-2025, 22, npm, 3)	27m 57s
e2e_windows (windows-2025, 22, npm, 0)	30m 55s
e2e_windows (windows-2025, 22, npm, 4)	28m 27s
e2e_windows (windows-2025, 22, esbuild, 2)	24m 48s
e2e_windows (windows-2025, 22, esbuild, 0)	23m 52s
e2e_windows (windows-2025, 22, esbuild, 3)	25m 15s
e2e_windows (windows-2025, 22, esbuild, 1)	24m 39s
e2e_windows (windows-2025, 22, esbuild, 5)	33m 39s
e2e_windows (windows-2025, 22, esbuild, 4)	21m 34s
e2e_windows (windows-2025, 22, npm, 5)	27m 4s
test	10m 45s
publish-snapshots	4m 57s
Browser Compatibility Tests	8m 52s
e2e-package-managers	0s
e2e	0s
e2e-snapshots	0s
	6h 7m 22s

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