fix(@angular/build): disable Vitest test isolation by default #2447

Job	Run time
list	23s
workflow (modules-builder-tests)	1m 43s
workflow (devkit-core-tests-rerun)	1m 15s
workflow (build-cli)	1m 38s
workflow (devkit-core-tests)	1m 12s
workflow (build-unit-tests)	2m 26s
	8m 37s

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