fix(@angular/build): adjust sourcemap sources when Vitest wrapper is … #2917

Job	Run time
list	18s
workflow (build-cli)	1m 45s
workflow (modules-builder-tests)	2m 2s
workflow (devkit-core-tests)	1m 10s
workflow (devkit-core-tests-rerun)	1m 35s
workflow (build-unit-tests)	2m 35s
	9m 25s

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