fix(@angular/cli): isolate temporary package installations from paren… #4312

Job	Run time
list	40s
workflow (modules-builder-tests)	2m 2s
workflow (devkit-core-tests-rerun)	1m 36s
workflow (devkit-core-tests)	1m 36s
workflow (build-cli)	1m 29s
workflow (build-unit-tests)	3m 6s
	10m 29s

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