Change the globalLock of BrokerRoutingManager to be fair to prevent writer starvation

[somandal]

Changing the _globalLock of BrokerRoutingManager to enable fairness to avoid writer starvation in case of high number of readers.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.57%. Comparing base (d1a3bb8) to head (848728f).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #16932      +/-   ##
============================================
+ Coverage     63.47%   63.57%   +0.09%     
  Complexity     1411     1411              
============================================
  Files          3073     3073              
  Lines        180777   180777              
  Branches      27633    27633              
============================================
+ Hits         114755   114922     +167     
+ Misses        57174    56987     -187     
- Partials       8848     8868      +20     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	63.51% <100.00%> (+7.11%)	⬆️
java-21	63.49% <100.00%> (+0.03%)	⬆️
temurin	63.57% <100.00%> (+0.09%)	⬆️
unittests	63.56% <100.00%> (+0.09%)	⬆️
unittests1	56.45% <ø> (+0.01%)	⬆️
unittests2	33.68% <100.00%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Copilot]

Pull Request Overview

This PR modifies the BrokerRoutingManager to use a fair ReentrantReadWriteLock to prevent writer starvation when there are many concurrent readers accessing routing information.

• Changes the _globalLock from a non-fair to a fair ReentrantReadWriteLock