Run unit tests on macOS

Add utilities to create/init FederatedCode data repo #437

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Run time

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Job	Run time
run-unit-tests (3.11)	6m 6s
run-unit-tests (3.10)	7m 15s
run-unit-tests (3.12)	6m 29s
run-unit-tests (3.13)	8m 8s
	27m 58s