fix(@angular/build): normalize karma asset paths before lookup #793

Job	Run time
list	22s
workflow (build-cli)	1m 36s
workflow (modules-builder-tests)	1m 50s
workflow (devkit-core-tests)	1m 16s
workflow (devkit-core-tests-rerun)	1m 22s
workflow (build-unit-tests)	2m 19s
	8m 45s

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