Backport of events: WS protobuf messages should be binary into release/1.13.x #19256
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The [WebSockets spec](https://www.rfc-editor.org/rfc/rfc6455) states that text messages must be valid UTF-8 encoded strings, which protobuf messages virtually never are. This now correctly sends the protobuf events as binary messages. We change the format to correspond to CloudEvents, as originally intended, and remove a redundant timestamp and newline. We also bump the eventlogger to fix a race condition that this code triggers.
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Backport
This PR is auto-generated from #19232 to be assessed for backporting due to the inclusion of the label backport/1.13.x.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
The WebSockets spec states that text messages must be valid UTF-8 encoded strings, which protobuf messages virtually never are.
This instead correctly sends the protobuf events as binary messages.
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