fix(@angular/build): exclude .angular from coverage instrumentation #8727

Job	Run time
build	2m 2s
lint	2m 2s
build-e2e-windows	2m 2s
publish-snapshots	1s
Browser Compatibility Tests	1s
test	1s
e2e-snapshots	1s
e2e-package-managers	1s
e2e	1s
e2e-windows	1s
	6m 13s

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