ci: publish release notes with pr titles

[IlyasShabi]

What does this PR do?:
Use release-notes.js script to add automatically the release notes with commit titles.

Motivation:
The current one was missing the titles https://github.com/DataDog/pprof-nodejs/releases/tag/v5.20.0 before I fixed it manually using the script.

Additional Notes:
We can run the script locally to generate release notes for previous releases as well.

[github-actions]

Overall package size

Self size: 2.62 MB
Deduped: 3.32 MB
No deduping: 3.32 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | pprof-format | 2.3.2 | 504.33 kB | 504.33 kB | | source-map | 0.8.0 | 185.66 kB | 185.66 kB | | node-gyp-build | 4.8.4 | 13.86 kB | 13.86 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}