feat(sync): add machine-labeled session sources #405

Job	Run time
run / scripts	7s
run / frontend-node-25	1m 58s
run / Go Test (race detector)	9m 24s
run / integration	2m 17s
run / e2e	7m 54s
run / Go Test (ubuntu-latest)	7m 27s
run / Desktop Unit Tests (Windows)	1m 43s
run / docs	36s
run / Go Test (windows-latest)	21m 23s
run / frontend	2m 59s
run / lint	6m 35s
	1h 2m 23s

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