Previously, we manually copied the `tarball/content` folder over when bootstrapping the VMR. Now it is handled by the darc tooling when you point it to the right dir.
Adds a pipeline that will trigger on main commits and synchronize the [VMR](https://github.com/dotnet/dotnet).
The pipeline has 2 parameters:
- What commit of installer to sync to (defaults to commit that triggered the build)
- What branch of the VMR it pushes to (defaults to branch that triggered the build)
