Update changelog for the performance regression caused by ensureLeadership in leaseRenew

[ahrtr]

Linked to,

• Skip leadership check if the etcd instance is active processing heartbeats #18428
• [3.5] Skip leadership check if the etcd instance is active processing heartbeats #18439
• [3.4] Skip leadership check if the etcd instance is active processing heartbeats #18440
• Performance Issue: CPU usage of the leader node increased by 20% #18069

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.80%. Comparing base (c147425) to head (4343997).
Report is 2 commits behind head on main.

❗ Current head 4343997 differs from pull request most recent head 4b8e784

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Additional details and impacted files

see 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18441      +/-   ##
==========================================
- Coverage   68.85%   68.80%   -0.05%     
==========================================
  Files         420      420              
  Lines       35475    35475              
==========================================
- Hits        24425    24409      -16     
- Misses       9623     9640      +17     
+ Partials     1427     1426       -1     

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[jmhbnz]

LGTM - Thanks @ahrtr

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