Error when creating Citus worker to a formation

I have existing Citus database worker pairs joined pgautofailover formation with `pg_autoctl create postgres` command using pgautofailover v1.6.3

Now I've upgraded pgautofailover to v2.0. I removed those Citus worker nodes from the formation and tried to re-add them using `pg_autoctl create worker` command. Everything looks good except it will error out with the following message:

```
04:44:17 22191 WARN NOTICE: extension "pg_stat_statements" already exists, skipping
04:44:17 22191 ERROR Failed to create extension "pg_stat_statements"[XX000]: ERROR: operation is not allowed on this node
HINT: Connect to the coordinator and run it again.
```

It looks like it was going to skip the step of implementing `pg_stat_statements` extension but it didn't. It feels like a bug. I wasn't able to find a way to move forward with these. But to give more context, here's the full log when I run `pg_autoctl create worker`:

```
04:44:16 22187 INFO Started pg_autoctl postgres service with pid 22190
04:44:16 22190 INFO /usr/pgsql-13/bin/pg_autoctl do service postgres --pgdata /mnt/lib/pgsql/13/data/ -v
04:44:16 22187 INFO Started pg_autoctl node-init service with pid 22191
04:44:16 22191 INFO Registering Postgres system 7276565784674612022 found at "/mnt/lib/pgsql/13/data"
04:44:16 22191 INFO Registered node 37 "worker1a" (test-c-worker-0-p:5432) in formation "test-c-worker-0", group 1, state "single"
04:44:16 22191 INFO Writing keeper state file at "/var/lib/pgsql/.local/share/pg_autoctl/mnt/lib/pgsql/13/data/pg_autoctl.state"
04:44:16 22191 INFO Writing keeper init state file at "/var/lib/pgsql/.local/share/pg_autoctl/mnt/lib/pgsql/13/data/pg_autoctl.init"
04:44:16 22191 INFO Successfully registered as "single" to the monitor.
04:44:16 22191 INFO FSM transition from "init" to "single": Start as a single node
04:44:16 22191 INFO Initialising postgres as a primary
04:44:16 22191 WARN Skipping HBA edits (per --skip-pg-hba) for rule: hostssl "claim" "postgres" test-c-worker-0-p trust
04:44:16 22191 INFO Contents of "/mnt/lib/pgsql/13/data/postgresql-auto-failover.conf" have changed, overwriting
04:44:16 22197 INFO /usr/pgsql-13/bin/postgres -D /mnt/lib/pgsql/13/data -p 5432 -h *
04:44:17 22191 INFO The user "postgres" already exists, skipping.
04:44:17 22191 INFO CREATE DATABASE citus;
04:44:17 22191 INFO The database "citus" already exists, skipping.
04:44:17 22191 INFO CREATE EXTENSION pg_stat_statements;
04:44:17 22191 WARN NOTICE: extension "pg_stat_statements" already exists, skipping
04:44:17 22191 ERROR Failed to create extension "pg_stat_statements"[XX000]: ERROR: operation is not allowed on this node
HINT: Connect to the coordinator and run it again.

04:44:17 22191 ERROR Failed to create extension pg_stat_statements
04:44:17 22191 ERROR Failed to transition from state "init" to state "single", see above.
04:44:17 22187 ERROR pg_autoctl service node-init exited with exit status 12
```

Thanks,

cc. @DimCitus