Commits on Nov 18, 2024

1. PipelineBusV2 deadlock proofing (#16671) …

   * 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)

   

   yaauie authored and logstashmachine committed Nov 18, 2024
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