provision: Don't run create_realm_internal_bots management command.

We essentially stop running create_realm_internal_bots during
every provisioing and move its operations to run from populate db.
In fact to speed things up a bit we actually make populate db call the
funcs which create_realm_internal_bots calls behind the scenes.

Fixes: #9467.

tools/lib/provision.py

@@ -384,8 +384,6 @@ def main(options):
         else:
             print("No need to run `manage.py compilemessages`.")
 
-        run(["./manage.py", "create_realm_internal_bots"])  # Creates realm internal bots if required.
-
     run(["scripts/lib/clean-unused-caches"])
 
     version_file = os.path.join(UUID_VAR_PATH, 'provision_version')