[AUTO] Add release notes for 3.7.0

[opensearch-ci-bot]

Add release notes for 3.7.0

Borderline Calls

• Add missing fields to workflow steps matching ml-commons builders #1360: Placed in Features — could be Enhancements since it adds optional fields to existing steps, but the PR unblocks entirely new use cases (MCP connector creation, unified agent interface) which constitute new functionality.
• Set provisioned_by field on ML resources for adoption metrics #1388: Placed in Features — could be Enhancements since it adds a field to existing builders, but it enables a new capability (adoption metrics attribution) that didn't exist before.
• Add response processor to flow agent agentic search template #1367: Placed in Features — could be Enhancements since it adds a processor to an existing template, but it introduces new functionality (DSL query in response) to the flow agent template.
• Use ML Commons validation methods in workflow parsing #1368: Placed in Enhancements — could be Features since it adds new validation logic, but it improves the reliability of existing workflow parsing rather than introducing a new user-facing feature.
• Support Jackson 3.x release line #1376: Placed in Maintenance — could be Infrastructure, but this is a dependency compatibility update rather than a build/CI change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.57%. Comparing base (59800e6) to head (53d9cbc).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1389   +/-   ##
=========================================
  Coverage     78.57%   78.57%           
  Complexity     1315     1315           
=========================================
  Files           106      106           
  Lines          6045     6045           
  Branches        647      647           
=========================================
  Hits           4750     4750           
  Misses         1004     1004           
  Partials        291      291           

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