client: Send `User-Agent` header on WebSocket connection requests (#35280)
This PR makes it so we send the `User-Agent` header on the WebSocket
connection requests when connecting to Collab.
We use the user agent set on the parent HTTP client.
Release Notes:
- N/A
f9224b1d74Marshall Bowers committed on 7/29/2025, 4:53:56 PM· committed by GitHubparentaa3437e