Remove manual CHANGELOG

[cwperks]

Description

Similar to opensearch-project/OpenSearch#21083, this will defer release note generation to the LLM workflow described here: https://github.com/opensearch-project/opensearch-build/blob/main/src/release_notes_workflow/README.md

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)

Maintenance

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.06%. Comparing base (db9efb6) to head (e728017).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6071      +/-   ##
==========================================
+ Coverage   73.98%   74.06%   +0.08%     
==========================================
  Files         441      441              
  Lines       27413    27461      +48     
  Branches     4110     4116       +6     
==========================================
+ Hits        20281    20340      +59     
+ Misses       5193     5181      -12     
- Partials     1939     1940       +1     

see 5 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[cwperks]

FYI Had to push a commit to fix a spotless issue