A user (on 7.17.7) reported to me a situation where they were attempting to delete a snapshot and would get the log message `deleting snapshots [snapshot-test] from repository [my-snapshots]` but then no further messages at `INFO` or above; enabling some internal logging indicated some low-level timeouts:

```
[DEBUG][com.amazonaws.latency    ] [instance-0123456789] MaxRetriesExceeded=[true], ServiceName=[Amazon S3], ServiceEndpoint=[https://REDACTED/], Exception=[java.net.SocketTimeoutException: Read timed out, java.net.SocketTimeoutException: Read timed out, java.net.SocketTimeoutException: Read timed out, java.net.SocketTimeoutException: Read timed out],...
```

This was enough for the user to go and investigate some performance issues in their repository, but I find the lack of logging concerning. Eventually the cluster state contains no ongoing snapshot deletion, but there is nothing in the logs to indicate that anything didn't work. The deletion API request had already timed out by this point so we can't return an error that way either. I'm opening this issue to make sure we investigate the missing logging.
server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java
}
        @Override
        public void onFailure(Exception e) {
            logger.info(() -> "Failed to remove all snapshot tasks for repo [" + repository + "] from cluster state", e);
            failAllListenersOnMasterFailOver(e);
        }
        @Override
        public void clusterStateProcessed(ClusterState oldState, ClusterState newState) {
            logger.warn(
                () -> format("Removed all snapshot tasks for repository [%s] from cluster state, now failing listeners", repository),
                failure
            );
            synchronized (currentlyFinalizing) {
                Tuple<Snapshot, Metadata> finalization;
                while ((finalization = repositoryOperations.pollFinalization(repository)) != null) {
                    assert snapshotsToFail.contains(finalization.v1())
                        : "[" + finalization.v1() + "] not found in snapshots to fail " + snapshotsToFail;
                }
                leaveRepoLoop(repository);
                for (Snapshot snapshot : snapshotsToFail) {
                    failSnapshotCompletionListeners(snapshot, failure);
                }
                for (String delete : deletionsToFail) {
                    failListenersIgnoringException(snapshotDeletionListeners.remove(delete), failure);
                    repositoryOperations.finishDeletion(delete);
                }
            }
        }
    }
    private static final class OngoingRepositoryOperations {