[release/9.0] Fix preserving messages for stateful reconnect with backplane #61374
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Backport of #60900 to release/9.0
/cc @BrennanConroy
Fix preserving messages for stateful reconnect with backplane
Description
When using the Redis backplane with SignalR combined with stateful reconnect, messages received from the backplane are not correctly accounted for on the server-side. This means that if the client disconnects and does a stateful reconnect the server will not properly send missed messages and potentially other issues which could result in the connection being disconnected due to server errors.
Fixes #55575
Customer Impact
Stateful reconnect with Redis backplane is essentially broken and should not be used together until fixed.
Regression?
Risk
Added missing E2E test to verify scenario.
Verification
Packaging changes reviewed?