refactor(@angular/cli): parallelize MCP zoneless migration file disco… #2415

Job	Run time
build	18s
build-e2e-windows	21s
lint	1m 50s
publish-snapshots	0s
e2e-package-managers	0s
Browser Compatibility Tests	0s
test	0s
e2e	0s
e2e-snapshots	0s
e2e-windows	0s
	2m 29s

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