MM-56881 Validate and ensure valid CustomStatus is stored (#26287)

* don't allow invalid CustomStatus

* allow empty emoji in custom status

* lint fix

* add english translation

* update for review comments.

* fix bad fix

---------

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

server/i18n/en.json

@@ -9770,6 +9770,10 @@
     "id": "model.user.is_valid.id.app_error",
     "translation": "Invalid user id."
   },
+  {
+    "id": "model.user.is_valid.invalidProperty.app_error",
+    "translation": "Invalid props (custom status)"
+  },
   {
     "id": "model.user.is_valid.last_name.app_error",
     "translation": "Invalid last name."