feat(@schematics/angular): migrate fake async to Vitest fake timers #3021

Job	Run time
build	19s
build-e2e-windows	22s
lint	2m 55s
e2e-windows	-1s
publish-snapshots	0s
Browser Compatibility Tests	0s
test	0s
e2e	0s
e2e-package-managers	0s
e2e-snapshots	0s
	3m 35s

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