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
private void tryStartSnapshotAfterCloneFinish(RepositoryShardId repoShardId, ShardGeneration generation) {
                assert entry.source() == null;
                
                if (isQueued(entry.shardsByRepoShardId().get(repoShardId))) {
                    startShardSnapshot(repoShardId, generation);
                }
            }
            private void startShardSnapshot(RepositoryShardId repoShardId, ShardGeneration generation) {
                final Index index = entry.indexByName(repoShardId.indexName());
                assert index != null
                    : "index ["
                        + repoShardId.index()
                        + "] must exist in snapshot entry ["
                        + entry
                        + "] because it's a normal snapshot but did not";
                
                
                final IndexRoutingTable indexRouting = initialState.routingTable().index(index);
                final ShardRouting shardRouting;
                if (indexRouting == null) {
                    shardRouting = null;
                } else {
                    shardRouting = indexRouting.shard(repoShardId.shardId()).primaryShard();
                }
                final ShardSnapshotStatus shardSnapshotStatus = initShardSnapshotStatus(generation, shardRouting);
                final ShardId routingShardId = shardRouting != null ? shardRouting.shardId() : new ShardId(index, repoShardId.shardId());
                if (shardSnapshotStatus.isActive()) {
                    startShardOperation(shardsBuilder(), routingShardId, shardSnapshotStatus);
                } else {