fix(@angular/build): normalize paths for Vitest runner output files #2034

Job	Run time
list	21s
workflow (devkit-core-tests-rerun)	1m 30s
workflow (build-unit-tests)	2m 20s
workflow (devkit-core-tests)	1m 17s
workflow (build-cli)	1m 38s
workflow (modules-builder-tests)	1m 47s
	8m 53s

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