fix(@angular/build): canonicalize drive letter casing for workspace r… #3945

Job	Run time
list	26s
workflow (build-cli)	1m 35s
workflow (modules-builder-tests)	1m 34s
workflow (build-unit-tests)	1m 36s
workflow (devkit-core-tests)	1m 18s
workflow (devkit-core-tests-rerun)	1m 19s
	7m 48s

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