Log Messages: Coordinator not added as a worker node error

If we are trying to perform an operation where the coordinator should be added as a worker node to the cluster, we get the following error:

```
[local] talha@talha:9700-5786=# select create_citus_local_table('citus_local');
ERROR: could not find the coordinator node in metadata as it is not added as a worker
```
Here, we can give what to run to the user so that they know what the solution is. Currently the solution is not that clear, as in the user needs to find what to run.