update sync-config-schema, allow for manual trigger

[hidalgopl]

What issue type does this pull request address? (keep at least one, remove the others) /kind bugfix /kind enhancement

I noticed that sync-config.yaml on main had a few issues:

• determining if version is latest was broken (it pulled the latest version from github API in the workflow that run on the release creation, so "latest" was actually the previous latest)
• it was running two times on one release (because it had on.release.types set to released & published - now it's on released only
• added an option to manually trigger this workflow with a release tag as an input. This will allow to retrospectively update the values.schema.yaml in vcluster-config repo.

What else do we need to know? mirror PR: https://github.com/loft-sh/loft-enterprise/pull/3367

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