Removed post limit warning banner (#27036)

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

server/i18n/en.json

@@ -5682,10 +5682,6 @@
     "id": "app.limits.get_app_limits.user_count.store_error",
     "translation": "Failed to get user count"
   },
-  {
-    "id": "app.limits.get_server_limits.post_count.store_error",
-    "translation": "Failed to get post count"
-  },
   {
     "id": "app.login.doLogin.updateLastLogin.error",
     "translation": "Could not update last login timestamp"