stream: refactor to use `validateAbortSignal`
All APIs currently accept any AbortSignal
-like objects, which is what validateAbortSignal
checks for. Let's use this here for consistency.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
All APIs currently accept any AbortSignal
-like objects, which is what validateAbortSignal
checks for. Let's use this here for consistency.