fix(@angular/build): correctly resolve absolute setup file paths in V… #9764

Job	Run time
lint	3m 8s
build-e2e-windows	1m 42s
build	1m 43s
e2e-windows	1s
Browser Compatibility Tests	1s
publish-snapshots	1s
test	1s
e2e	1s
e2e-snapshots	1s
e2e-package-managers	1s
	6m 40s

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