[Backport 2.7] Release Notes for 2.7.0

[opensearch-trigger-bot]

Backport b92ea2e from #1537

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.18%. Comparing base (74d2d67) to head (36e0c1c).
⚠️ Report is 8 commits behind head on 2.7.

❌ Your project status has failed because the head coverage (97.18%) is below the target coverage (99.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff            @@
##                2.7    #1540   +/-   ##
=========================================
  Coverage     97.18%   97.18%           
  Complexity     4098     4098           
=========================================
  Files           371      371           
  Lines         10445    10445           
  Branches        703      703           
=========================================
  Hits          10151    10151           
  Misses          287      287           
  Partials          7        7           

Flag	Coverage Δ
sql-engine	97.18% <ø> (ø)

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