Automatic release generation when changing plugin version

[bitbrain]

When updating the version of the plugin file (only on godot-3.x and godot 4.x branches), automatically generate a tag and push a release with generated release notes + generated discussion.

👉 we perhaps need to introduce a new Github action first that is able to extract the version from a plugin file and does a tag exists check before generation, similar to https://github.com/bitbrain/jekyll-dash/blob/main/.github/workflows/build-tag.yml#L20