Run unit tests on macOS

Add left-pane file tree view and related templates #129

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Run time

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Job	Run time
run-unit-tests (3.11)	4m 40s
run-unit-tests (3.10)	6m 24s
run-unit-tests (3.13)	5m 30s
run-unit-tests (3.12)	5m 32s
	22m 6s