**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


NameSet finished_hosts; 
    NameSet ignoring_hosts; 
    Strings current_active_hosts; 
    size_t num_hosts_finished = 0;
    
    std::unique_ptr<Exception> first_exception;
    Int64 timeout_seconds = 120;
};
BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, const Context & context, AccessRightsElements && query_requires_access, bool query_requires_grant_option)
{
    
    ASTPtr query_ptr = query_ptr_->clone();
    ASTQueryWithOutput::resetOutputASTIfExist(*query_ptr);
    
    auto * query = dynamic_cast<ASTQueryWithOnCluster *>(query_ptr.get());
    if (!query)
    {
        throw Exception("Distributed execution is not supported for such DDL queries", ErrorCodes::NOT_IMPLEMENTED);
    }
    if (!context.getSettingsRef().allow_distributed_ddl)
        throw Exception("Distributed DDL queries are prohibited for the user", ErrorCodes::QUERY_IS_PROHIBITED);
    if (const auto * query_alter = query_ptr->as<ASTAlterQuery>())
    {
        for (const auto & command : query_alter->command_list->children)
        {
            if (!isSupportedAlterType(command->as<ASTAlterCommand&>().type))
                throw Exception("Unsupported type of ALTER query", ErrorCodes::NOT_IMPLEMENTED);
        }
    }
    query->cluster = context.getMacros()->expand(query->cluster);