[Backport release-1.4.0-alpha2] fix: notify new SnapshotReplicationListeners about missed replications
#8855
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We are using `SnapshotReplicationListener`s to transition to inactive when a snapshot replication starts. Snapshot replication can start before any listeners have registered, which means that the listener will only be notified about snapshot replication finishing, triggering a transition to follower without first transitioning to inactive. Here we are keeping track of ongoing snapshot replication to immediately notify listeners when they are registering. (cherry picked from commit 3d1f6c5)
(cherry picked from commit be9f78f)
Previously, we only notified new listeners about ongoing replication. This was not enough in cases where snapshot replication finished before the listener completed. (cherry picked from commit 47badee)
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Description
Backport of #8834 to
release-1.4.0-alpha2.relates to #8830