DM-16160: Restore pre-insert uniqueness check in addDataset(). #98
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Re-apply commit 7f85ed5: "Implement constraint check in associate method"
and testore pre-insert uniqueness check in addDataset().
Also pass transactional=False when calling associate() from
addDataset().
This is a workaround for previous commit breaking obs_subaru unit tests.
Actual problem lies deeper in transaction management in
lsst.obs.base.ingest module, that will have to be fixed later, see
discussion on (DM-16160)