build: migrate `@ngtools/webpack` to `ts_project` #182

Job	Run time
list	39s
workflow (build-cli)	1m 58s
workflow (modules-builder-tests)	2m 25s
workflow (devkit-core-tests)	2m 5s
workflow (devkit-core-tests-rerun)	1m 55s
workflow (build-unit-tests)	2m 13s
	11m 15s

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