[core] auto create release notes with every push on develop

[khassel]

and remove CHANGELOG.md logic.

This is my attempt to create a draft release instead of editing a changelog, see discussion on discord.

Logic:

• new github workflow .github/workflows/release-notes.yaml
• runs with every push on develop (so after PR's are merged)
• collects the commits on develop which are newer than the latest tag
• searches the commit messages for keywords defined in an array and group the messages into categories (this is a first shot, we will update this ...)
• creates markdown content
• looks for an untagged and unpublished draft release with name unreleased, if it exists, it will be deleted
• creates an untagged and unpublished draft release with name unreleased with markdown content created above

Example created on my fork (this caused having MagicMirrorOrg in the PR-Links):

Please review this PR, it is a draft release at the moment because I got problems in my fork where I tested this: The created draft release is not visible at the moment (they are visible via api). AFAIS this is a queue problem on GitHub, maybe I flooded their queue while testing ... So I will test this tomorrow again before removing draft here.

[KristjanESPERANTO]

I've skimmed through it and it looks really good to me! 👍

[sdetweil]

Looks good.

[khassel]

The created draft releases are now visible again on my fork, so from my side this is now ready to merge.