[release/8.0] [SignalR] Don't throw for message headers in Java client #62784
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Backport of #62739 to release/8.0
/cc @BrennanConroy
[SignalR] Don't throw for message headers in Java client
Description
If a Java client connects to a SignalR server that is writing "headers" (SignalR protocol concept), then the connection will close with an error.
This happened when Azure SignalR Service (ASRS) added some distributed tracing information to messages and broke a bunch of customer apps. The change has since been reverted by ASRS, but we would like to fix the Java clients to allow this feature to be readded in the future.
Fixes #62713
Customer Impact
Customer client apps broken by server upgrade. Issue linked above shows many customers hit by this.
Regression?
Risk
Unused code currently. In the future it may be used, and it's fairly simple code with a couple tests added for it.
Verification
Packaging changes reviewed?