refactor(@angular/build): use `ngHmrMode` define for Vite prebundling #916

Job	Run time
list	31s
workflow (devkit-core-tests)	1m 28s
workflow (modules-builder-tests)	1m 51s
workflow (build-unit-tests)	2m 20s
workflow (devkit-core-tests-rerun)	1m 23s
workflow (build-cli)	1m 36s
	9m 9s

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