patroni / patroni / 16561653575

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Recreate (permanent) physical slot when it doesn't reserve WAL (#3388)

It could happen that (permanent) physical slot was created outside of Patroni without reserving WAL.
For such slots pg_replication_slot_advance() function throws an error:
```sql
ERROR:  replication slot "foo" cannot be advanced
DETAIL:  This slot has never previously reserved WAL, or it has been invalidated.
```

To mitigate the problem we will drop (permanent) physical slots without `restart_lsn` and let state machine to recreate them on the next cycle.

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