[AUTO] Add release notes for 3.4.0

[opensearch-ci-bot]

Add release notes for 3.4.0

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch release-chores/release-notes-3.4.0

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[sandeshkr419]

@opensearch-ci-bot recreate

[sandeshkr419]

Seems like the file is truncated and the bot failed to parse all the changelog.

[andrross]

@asimmahmood1 @sandeshkr419 I fixed this by manually moving the contents of the CHANGELOG into the release notes file.

[asimmahmood1]

@asimmahmood1 @sandeshkr419 I fixed this by manually moving the contents of the CHANGELOG into the release notes file.

Thanks @andrross, I guess I could've spent the same time to do same myself :)