Remove the ability to customize the postgres_data_dir (#1798)

* in the sclorg Postgresql 15 image, the PGDATA directory is hardcoded
* if users were to modify this directory, they would only change the
  directory the pvc is mounted to, not the directory PostgreSQL uses.
  This would result in loss of data.
* switch from /var/lib/pgsql/data/pgdata to /var/lib/pgsql/data/userdata

.helm/starter/templates/storage/postgres-pv.yaml

@@ -13,7 +13,7 @@ spec:
     storage: {{ default "8Gi" .size | quote }}
   storageClassName: {{ include "postgres.storageClassName" $ }}
   hostPath:
-    path: {{ required "customVolumes.postgres.hostPath or spec.postgres_data_path are required!" (default ($.Values.AWX.spec).postgres_data_path .hostPath) | quote }}
+    path: /var/lib/pgsql/data/userdata
+{{- end }}
 {{- end }}
 {{- end }}
-{{- end }}