Find better alternative for local release note generation

[hferentschik]

The helper script release.sh uses:

jx step changelog -v $version -p $prev_tag_base -r $current_tag_base --generate-yaml=false --no-dev-release --update-release=false

This works, however, this step is supposed to run in cluster and prints a lot of warnings when running locally. Partly because it will always use the pipeline's user credentials.
Also, due to the credential issue, the changelog is just written to the console and one needs to manually cut&paste.

A short jq script should do the trick.

[hferentschik]

🎉 This issue has been resolved in version 1.2.1 🎉

The release is available on GitHub release

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