Added missed license check for channel banner in patch channel API (#30445)

* Added missed license check for channel banner in patch channel API

* Extractced permission check function

server/i18n/en.json

@@ -8376,6 +8376,10 @@
     "id": "jobs.set_job_error.update.error",
     "translation": "Failed to set job status to error"
   },
+  {
+    "id": "license_error.feature_unavailable",
+    "translation": "Feature is not available for the current license"
+  },
   {
     "id": "manaultesting.manual_test.parse.app_error",
     "translation": "Unable to parse URL."