Two phase cleanup for Listener Objects

[Santhosha-bk]

Description

Fixed registration shutdown listener race by safely snapshotting listeners before stopping them.

During registration shutdown, listeners are now drained from the shared registration list under lock, and each listener is conditionally pinned with a non-zero refcount acquire. Only successfully pinned listeners are moved to a private pending list, then stopped outside the lock and released afterward.

This prevents shutdown from touching listeners that concurrently reached refcount zero, avoids stale-list traversal risks, and keeps listener lifetime handling safe under concurrent close/shutdown interleaving's.

Fixes : https://microsoft.visualstudio.com/OS/_workitems/edit/61981303/

Testing

Documentation

N/A

[codecov]

Codecov Report

❌ Patch coverage is 36.36364% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.69%. Comparing base (6525fb3) to head (d6c9d7e).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core/registration.c	36.36%	7 Missing ⚠️

❌ Your patch check has failed because the patch coverage (36.36%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6075      +/-   ##
==========================================
- Coverage   85.93%   84.69%   -1.25%     
==========================================
  Files          60       60              
  Lines       18798    18847      +49     
==========================================
- Hits        16155    15963     -192     
- Misses       2643     2884     +241     

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