Reactivate the upstream workflows and buildscript checks

[EnnuiL]

Currently, our workflows have a lot of upstream stuff that has been disabled in order to allow CI to work; While they don't really matter? They can't remain disabled forever, we must investigate reactivating those where possible;
This isn't only limited to workflows though, the buildscript also has a lot of disabled code that should be reactivated when possible. While there has been effort towards that (like re-enabling AW generation), there has been some setbacks like the package-info.java generator and the Quilt Gradle Licenser not liking it's face