doc(oidc,test): remove group column for predefined Keycloak users

As the OIDC provider does not yet provide proper support mapping from OIDC groups to Dataverse groups, remove this from the docs for now. Re-add when #9969 is (being) resolved.

Co-authored-by: Philip Durbin <[email protected]>

doc/sphinx-guides/source/developers/remote-users.rst

@@ -61,19 +61,14 @@ You should be able to log into Keycloak with the one of the following credential
 
   * - Username
     - Password
-    - Group
   * - admin
     - admin
-    - admins
   * - curator
     - curator
-    - curators
   * - user
     - user
-    - members
   * - affiliate
     - affiliate
-    - \-
 
 In case you want to stop and remove the Keycloak container, just run the other available bash script: