[8.x] Tighten up threading in snapshot finalization (#124403) #124535
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Today snapshot finalization does nontrivial work on the calling thread (often the cluster applier thread) and also in theory may fork back to the cluster applier thread in `getRepositoryData`, yet it always forks at least one task (the `SnapshotInfo` write) to the `SNAPSHOT` pool anyway. With this change we fork to the `SNAPSHOT` pool straight away and then make sure to stay on this pool throughout.
DaveCTurner
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:Distributed Coordination/Snapshot/Restore
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Backports the following commits to 8.x: