core: server stream should not deliver halfClose() when call is immediately cancelled #9362
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Client sends headers, message and halfClose.
Before server can complete the call, RST_STREAM is sent because of cancellation.
Due to server application
request()
(run in serializingExecutor) possibly delay, server stream scheduledhalfClose()
(run in serializingExecutor) beforeMessageAvailable()
, causingINTERNAL, desc: Half-closed without a request
at server call.fix #8866