[MM-59072] Don't require user ID in caption message #810
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Summary
While working on mattermost/calls-transcriber#27, I realized that any connected client could craft a WebSocket message to display arbitrary captions from any other user connected to the call.
The UserID field was also redundant since we can easily find that information from the call session object.
Ticket Link
https://mattermost.atlassian.net/browse/MM-59072