[FEATURE] Automate release notes

[rupal-bq]

Is your feature request related to a problem?
Manually creating release notes is prone to error

What solution would you like?
Add automation to generate release notes

[rupal-bq]

automation suggestion: https://github.com/opensearch-project/opensearch-plugins/blob/main/RELEASE_NOTES.md#automation

[Swiddis]

Copying from side-channel discussion: I haven't gotten the Github action to work consistently on repos where it's been implemented for a while, eventually I resorted to writing a script for it: https://github.com/Swiddis/opensearch-utils/tree/main/release

Not quite as convenient as the promise of an action that lets you just click "Generate notes", but it's been working for me for the 2.13 release.

[dblock]

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