**Describe the bug**
For DATABASE ENGINE Atomic (used by Default for all databases from 20.10) 
when try to `DROP TALBE replicatedmergetree table ON CLUSTER ... SYNC`, query failed after `distributed_ddl_task_timeout` seconds
`decrease `database_atomic_delay_before_drop_table_sec=1` and setup `database_atomic_wait_for_drop_and_detach_synchronously=1` for default user profile didn't help

**How to reproduce**
just look to https://gist.github.com/Slach/a7f2946a108883f6b1d5585b1b5b6b0d
```
bash -x ./reproduce.sh
```

* Which ClickHouse server version to use
Latest official docker build

* Non-default settings, if any
```
<yandex>
    <database_atomic_delay_before_drop_table_sec>1</database_atomic_delay_before_drop_table_sec>
    <profile>
        <default>
            <database_atomic_wait_for_drop_and_detach_synchronously>1</database_atomic_wait_for_drop_and_detach_synchronously>
            <distributed_ddl_task_timeout>20</distributed_ddl_task_timeout>
        </default>
    </profile>
</yandex>

```

**Expected behavior**
Successfull DROP TABLE on cluster

**Error message and/or stacktrace**
Code: 159. DB::Exception: Received from localhost:9000. DB::Exception: Watching task /clickhouse/task_queue/ddl/query-0000000001 is executing longer than distributed_ddl_task_timeout (=20) seconds. There are 2 unfinished hosts (0 of them are currently active), they are going to execute the query in background.

**Additional context**
table physically deleted, but Atomic engine doesn't return "finished" flag to Zookeeper `distributed_ddl` queue

```
docker-compose exec clickhouse-0-0-0 clickhouse-client -q "SELECT * FROM system.zookeeper WHERE path='/clickhouse/task_queue/ddl/query-0000000001/finished' FORMAT
Vertical"
```

returns empty result


const ZooKeeperPtr & zookeeper)
{
    StorageReplicatedMergeTree * replicated_storage = dynamic_cast<StorageReplicatedMergeTree *>(storage.get());
    
    if (!replicated_storage)
        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Storage type '{}' is not supported by distributed DDL", storage->getName());
    
    
    
    auto get_shard_name = [] (const Cluster::Addresses & shard_addresses)
    {
        Strings replica_names;
        for (const Cluster::Address & address : shard_addresses)
            replica_names.emplace_back(address.readableString());
        std::sort(replica_names.begin(), replica_names.end());
        String res;
        for (auto it = replica_names.begin(); it != replica_names.end(); ++it)
            res += *it + (std::next(it) != replica_names.end() ? "," : "");
        return res;
    };
    String shard_node_name = get_shard_name(task.cluster->getShardsAddresses().at(task.host_shard_num));
    String shard_path = fs::path(node_path) / "shards" / shard_node_name;
    String is_executed_path = fs::path(shard_path) / "executed";
    String tries_to_execute_path = fs::path(shard_path) / "tries_to_execute";
    zookeeper->createAncestors(fs::path(shard_path) / ""); 
    
    zookeeper->tryCreate(tries_to_execute_path, "0", zkutil::CreateMode::Persistent);
    static constexpr int MAX_TRIES_TO_EXECUTE = 3;
    static constexpr int MAX_EXECUTION_TIMEOUT_SEC = 3600;
    String executed_by;