ci: Automate v-tag and GitHub release for flame (#3876)

Adds a new step to the `release-tag.yml` workflow that automatically:
1. Creates a short `v{version}` tag (e.g. `v1.36.0`) pointing at the
same commit as the melos-generated `flame-v{version}` tag
2. Creates a GitHub release with the flame package changelog as release
notes

This removes the manual step of creating the `v` tag and GitHub release
after each flame release.