MM-56536 Do not update team members scheme roles if user is guest (#25957)

* MM-56536 Do not update team members scheme roles if user is guest

* feedback review

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/i18n/en.json

@@ -3362,6 +3362,14 @@
     "id": "api.team.update_restricted_domains.mismatch.app_error",
     "translation": "Restricting team to {{ .Domain }} is not allowed by the system config. Please contact your system administrator."
   },
+  {
+    "id": "api.team.update_team_member_roles.guest.app_error",
+    "translation": "Invalid team member update: A guest cannot be made team member or team admin, please promote as a user first."
+  },
+  {
+    "id": "api.team.update_team_member_roles.guest_and_admin.app_error",
+    "translation": "Invalid team member update: A user must cannot be set as a guest and admin at the same time."
+  },
   {
     "id": "api.team.update_team_member_roles.guest_and_user.app_error",
     "translation": "Invalid team member update: A user must be a guest or a user but not both."