DelayedTransport shutdown race #7743
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To fix #6283.
Change to be more explicit and fail fast on ClientStream calls order before and after start(), corresponding to configuration and RPC calls, respectively. This fixes the issue because it guarantees that removing from pendingStream in delayedClientTransport means it is safe to shutdown. If by the time pendingStream is processed, start() has not been called yet, nothing will drain because of the explicit strict call check, and the subsequent calls will directly execute on the realStream. This is guarded in the locking block.