build: migrate `@ngtools/webpack` to `ts_project` #183

Job	Run time
list	39s
workflow (build-cli)	1m 57s
workflow (modules-builder-tests)	2m 29s
workflow (devkit-core-tests)	1m 47s
workflow (devkit-core-tests-rerun)	1m 51s
workflow (build-unit-tests)	2m 18s
	11m 1s

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