[Backport main] [AUTO] Add release notes for 3.6.0

[opensearch-trigger-bot]

Backport a661f30 from #6063.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.06%. Comparing base (db9efb6) to head (6b025fa).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6064      +/-   ##
==========================================
+ Coverage   73.98%   74.06%   +0.08%     
==========================================
  Files         441      441              
  Lines       27413    27461      +48     
  Branches     4110     4116       +6     
==========================================
+ Hits        20281    20340      +59     
+ Misses       5193     5183      -10     
+ Partials     1939     1938       -1     

see 6 files with indirect coverage changes

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