Cherrypick and Publish Changes Snapshot Management Operations

[chinmay-bhat]

PR in Progress, not ready for review

Create Cherry pick and Publish changes APIs and classes.

PR depends on unmerged changes in other PRs

• _deleted_data_files for _MergingSnapshotProducer from the partial deletes PR
• ancestors_of()

relevant - #737

[github-actions]

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[github-actions]

This pull request has been closed due to lack of activity. This is not a judgement on the merit of the PR in any way. It is just a way of keeping the PR queue manageable. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.