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

config/crd/bases/awx.ansible.com_awxs.yaml

@@ -1807,9 +1807,6 @@ spec:
               postgres_priority_class:
                 description: Assign a preexisting priority class to the postgres pod
                 type: string
-              postgres_data_path:
-                description: Path where the PostgreSQL data are located
-                type: string
               postgres_extra_args:
                 type: array
                 items:

config/manifests/bases/awx-operator.clusterserviceversion.yaml

@@ -637,11 +637,6 @@ spec:
         x-descriptors:
         - urn:alm:descriptor:io.kubernetes:StorageClass
         - urn:alm:descriptor:com.tectonic.ui:advanced
-      - displayName: Postgres Datapath
-        path: postgres_data_path
-        x-descriptors:
-        - urn:alm:descriptor:com.tectonic.ui:advanced
-        - urn:alm:descriptor:com.tectonic.ui:hidden
       - displayName: Postgres Extra Arguments
         path: postgres_extra_args
         x-descriptors: