MM-21882: Remove the license requirement to promote guests to regular users (#13790)

* MM-21882: Remove the license requirement to promote guests to regular users

* Removing unneded translation keys

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

i18n/en.json

@@ -2058,14 +2058,6 @@
     "id": "api.team.move_channel.success",
     "translation": "This channel has been moved to this team from %v."
   },
-  {
-    "id": "api.team.promote_guest_to_user.disabled.error",
-    "translation": "Guest accounts are disabled."
-  },
-  {
-    "id": "api.team.promote_guest_to_user.license.error",
-    "translation": "Your license does not support guest accounts"
-  },
   {
     "id": "api.team.remove_member.group_constrained.app_error",
     "translation": "Unable to remove a user from a group-constrained team."