✨(backend) offer an endpoint to save recording

I've protected this endpoint with a feature flag, and an authentication
class, as it will be exposed on the public internet.

I've tried to keep the viewset logic as minimal as possible, I've
to ship smth and will continue iterating on this piece of code.

At some point, abstracting webhook endpoint and authentication class
might be beneficial for the project. YAGNI as of today.

src/backend/core/recording/event/authentication.py

@@ -50,6 +50,9 @@ class StorageEventAuthentication(BaseAuthentication):
         if not settings.RECORDING_ENABLE_STORAGE_EVENT_AUTH:
             return MachineUser(), None
 
+        if not settings.RECORDING_ENABLE_STORAGE_EVENT_AUTH:
+            return MachineUser(), None
+
         required_token = settings.RECORDING_STORAGE_EVENT_TOKEN
         if not required_token:
             if settings.RECORDING_ENABLE_STORAGE_EVENT_AUTH: