[AUTO] Add release notes for 3.6.0

[opensearch-ci-bot]

Add release notes for 3.6.0

Borderline Calls

• Fix cluster setting validation #487: Placed in Bug Fixes — could also be Refactoring since it restructures where validation occurs, but the primary motivation is fixing a bug where invalid settings could be persisted.
• Stop fetching security snapshot in non-snapshot builds #560: Placed in Bug Fixes — could also be Infrastructure since it relates to build configuration, but the core issue is a functional bug causing 404 errors during release builds.
• Add recommendation data models for rule-based recommendation engine #549: Placed in Features — could be Enhancements since it adds data models supporting a larger feature, but these models represent net new functionality for the recommendation engine.
• Tag failed queries #540: Placed in Features — could be Enhancements since it adds an attribute to existing query tracking, but tracking failed queries is a new capability that was previously absent.
• Revert "fix(ci): Add cluster health check before running integ tests (#588) (#590)" #594: This is a revert of fix(ci): Add cluster health check before running integ tests #588 (cherry-pick [Backport 3.6] fix(ci): Add cluster health check before running integ tests #590). Both are included as they represent distinct commits in the 3.6 branch. Placed both in Infrastructure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.98%. Comparing base (4e43442) to head (cb8ef40).
⚠️ Report is 1 commits behind head on 3.6.

Additional details and impacted files

@@            Coverage Diff            @@
##                3.6     #596   +/-   ##
=========================================
  Coverage     77.98%   77.98%           
  Complexity      952      952           
=========================================
  Files            87       87           
  Lines          3630     3630           
  Branches        411      411           
=========================================
  Hits           2831     2831           
  Misses          607      607           
  Partials        192      192           

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