Project only the latest snapshot of each entity in a single batch #25
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This PR fixes the problem that if in a single sync:
We add all the root snapshots first and immediately project them as we add them, and end up trying to project 2 complex-form-components that violate our unique constraint.
The additional tests I added were failing while SaveChanges was inside the loop in the new
SnapshotsAdded()(as also decsribed in my comment below). They don't fail when it's outside the loop. So, maybe they add no value.