refactor(@schematics/angular): decompose transformSpies into modular … #3669

Job	Run time
list	37s
workflow (devkit-core-tests-rerun)	1m 38s
workflow (devkit-core-tests)	1m 37s
workflow (build-unit-tests)	2m 20s
workflow (build-cli)	1m 57s
workflow (modules-builder-tests)	1m 57s
	10m 6s

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