Today we log a "deleting snapshots [...] from repository [...]" message at INFO level [almost the first thing](https://github.com/elastic/elasticsearch/blob/dfaec0dbf0c8a0ba2912381334019725848f1f5a/server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java#L1886-L1888) when we start the deletion. However, the requested snapshots may not exist or they may be wildcards to be matched against actual snapshots. In these cases, the log message is either misleading or insuffiicent. Instead we should log the message after we have successfully added the delete to the cluster state similar to how the [logging works for snapshot creation](https://github.com/elastic/elasticsearch/blob/f77c16b78bab5e9f3ee24974aeba408e254e8c94/server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java#L3804).
server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java
throw new SnapshotException(
                        targetSnapshot,
                        "Can't clone index [" + indexId + "] because its snapshot was not successful."
                    );
                }
            }
            
            repository.getRepositoryData(ActionListener.wrap(repositoryData -> {
                for (IndexId index : indices) {
                    executor.execute(ActionRunnable.supply(shardCountListener, () -> {
                        final IndexMetadata metadata = repository.getSnapshotIndexMetaData(repositoryData, sourceSnapshot, index);
                        return Tuple.tuple(index, metadata.getNumberOfShards());
                    }));
                }
            }, onFailure));
        }, onFailure));
        
        allShardCountsListener.addListener(
            ActionListener.wrap(counts -> executeConsistentStateUpdate(repository, repoData -> new ClusterStateUpdateTask() {
                private SnapshotsInProgress.Entry updatedEntry;
                @Override
                public ClusterState execute(ClusterState currentState) {
                    final SnapshotsInProgress snapshotsInProgress = SnapshotsInProgress.get(currentState);
                    final String repoName = cloneEntry.repository();
                    final List<SnapshotsInProgress.Entry> existingEntries = snapshotsInProgress.forRepo(repoName);
                    final List<SnapshotsInProgress.Entry> updatedEntries = new ArrayList<>(existingEntries.size());
                    final String localNodeId = currentState.nodes().getLocalNodeId();
                    final ShardGenerations shardGenerations = repoData.shardGenerations();
                    for (SnapshotsInProgress.Entry existing : existingEntries) {
                        if (cloneEntry.snapshot().getSnapshotId().equals(existing.snapshot().getSnapshotId())) {