Backport PR #16671 to 8.15: PipelineBusV2 deadlock proofing #16681
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* pipeline bus: add deadlock test for unlisten/unregisterSender * pipeline bus: eliminate deadlock Moves the sync-to-notify out of the `AddressStateMapping#mutate`'s effective synchronous block to eliminate a race condition where unlistening to an address and unregistering a sender could deadlock. It is safe to notify an AddressState's attached input without exclusive access to the AddressState, because notifying an input that has since been disconnected is net zero harm. (cherry picked from commit 8af6343)
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Backport PR #16671 to 8.15 branch, original message:
Release notes
What does this PR do?
PipelineBus#unlistenandPipelineBus#unregisterSenderPipelineBusV2Why is it important/What is the impact to the user?
Failing to shut down is not good.
Checklist
[ ] I have made corresponding changes to the documentation[ ] I have made corresponding change to the default configuration files (and/or docker env variables)How to test this PR locally
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