fix(@angular/build): normalize `allowedHosts` in dev-server #3080

Job	Run time
list	53s
workflow (devkit-core-tests-rerun)	1m 31s
workflow (devkit-core-tests)	1m 30s
workflow (modules-builder-tests)	1m 54s
workflow (build-unit-tests)	2m 26s
workflow (build-cli)	1m 55s
	10m 9s

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