Do not store intermediate commits during merge/transplant #6677
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Do not store objects during dry runs.
Do not store objects when conflicts are detected.
Use a BatchingPersist during unsquashed merge/transplant execution and
flush only on success. This is to allow CommitLogic to 'see'
intermediate commits without writing them to storage. Batching writes in
this case is a secondary effect.
Move PersistDelegate to top level.
Add test tooling to allow validating whether any storage writes happened
since a checkpoint.
Also add a test case to make sure dry run merge/transplant operations
at the API level.
Note: exact response messages differ between old and new model in
this case, but substantial information is the same (keys from the
merge/transplant request).
Fixes #6674