fix(@angular/build): normalize `allowedHosts` in dev-server #3079

Job	Run time
list	21s
workflow (build-unit-tests)	2m 28s
workflow (build-cli)	1m 42s
workflow (devkit-core-tests)	1m 20s
workflow (devkit-core-tests-rerun)	1m 24s
workflow (modules-builder-tests)	2m 2s
	9m 17s

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