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
/**
         * Map of repository name to a deque of {@link Snapshot} that need to be finalized for the repository and the
         * {@link Metadata to use when finalizing}.
         */
        private final Map<String, Deque<Snapshot>> snapshotsToFinalize = new HashMap<>();
        /**
         * Set of delete operations currently being executed against the repository. The values in this set are the delete UUIDs returned
         * by {@link SnapshotDeletionsInProgress.Entry#uuid()}.
         */
        private final Set<String> runningDeletions = Collections.synchronizedSet(new HashSet<>());
        @Nullable
        private Metadata latestKnownMetaData;
        @Nullable
        synchronized Tuple<Snapshot, Metadata> pollFinalization(String repository) {
            assertConsistent();
            final Snapshot nextEntry;
            final Deque<Snapshot> queued = snapshotsToFinalize.get(repository);
            if (queued == null) {
                return null;
            }
            nextEntry = queued.pollFirst();
            assert nextEntry != null;
            final Tuple<Snapshot, Metadata> res = Tuple.tuple(nextEntry, latestKnownMetaData);
            if (queued.isEmpty()) {
                snapshotsToFinalize.remove(repository);
            }
            if (snapshotsToFinalize.isEmpty()) {
                latestKnownMetaData = null;