refactor(@angular-devkit/build-angular): remove protractor #3112

Job	Run time
list	29s
workflow (modules-builder-tests)	1m 58s
workflow (devkit-core-tests-rerun)	1m 17s
workflow (build-cli)	1m 42s
workflow (devkit-core-tests)	1m 30s
workflow (build-unit-tests)	2m 41s
	9m 37s

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