Invalid UUID in remove_self causes 500 instead of proper validation error #5779
Description
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Description
The remove_self endpoint in ChannelUserViewSet does not validate channel_id as a UUID before querying the database.
If a malformed UUID is passed, it raises an unhandled exception leading to a 500 Internal Server Error.
Expected Behavior
The endpoint should validate channel_id as a UUID before querying and return a 400 Bad Request if invalid.
Current Behavior
Malformed UUID inputs trigger a 500 error due to implicit failure during query execution.
Proposed Fix
Explicitly validate channel_id using UUID parsing before performing the database lookup.