refactor(@schematics/angular): flatten `transformSpyCallInspection` l… #2289

Job	Run time
list	22s
workflow (devkit-core-tests)	1m 14s
workflow (devkit-core-tests-rerun)	1m 18s
workflow (build-cli)	1m 41s
workflow (modules-builder-tests)	1m 47s
workflow (build-unit-tests)	2m 25s
	8m 47s

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