fix(@angular/build): normalize `allowedHosts` in dev-server #3078

Job	Run time
list	26s
workflow (build-unit-tests)	2m 33s
workflow (modules-builder-tests)	2m 4s
workflow (build-cli)	1m 44s
workflow (devkit-core-tests-rerun)	1m 35s
workflow (devkit-core-tests)	1m 20s
	9m 42s

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