refactor(@angular/build): remove deprecated browser-level isolate option #9195

Job	Run time
build-e2e-windows	3m 49s
lint	2m 13s
build	3m 26s
test	2m 9s
Browser Compatibility Tests	2m 10s
publish-snapshots	2m 11s
e2e-windows (windows-2025, 22, npm, 0)	1m 38s
e2e-windows (windows-2025, 22, npm, 5)	1m 46s
e2e-windows (windows-2025, 22, esbuild, 3)	1m 38s
e2e-windows (windows-2025, 22, esbuild, 0)	1m 46s
e2e-windows (windows-2025, 22, npm, 3)	1m 45s
e2e-windows (windows-2025, 22, esbuild, 1)	1m 38s
e2e-windows (windows-2025, 22, npm, 4)	1m 46s
e2e-windows (windows-2025, 22, npm, 1)	1m 46s
e2e-windows (windows-2025, 22, npm, 2)	1m 37s
e2e-windows (windows-2025, 22, esbuild, 4)	1m 46s
e2e-windows (windows-2025, 22, esbuild, 5)	1m 46s
e2e-windows (windows-2025, 22, esbuild, 2)	1m 46s
e2e-package-managers	1s
e2e-snapshots	1s
e2e	1s
	36m 39s

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