* Add support to build with the linux portable
* Pass targets to run for the linux portable
* Address PR comments
* Update the bootstrapper version
* Address the PR comments for improving the help text
* Fixing permissions
Use the crossgen and jit that comes with Microsoft.NETCore.App so we don't have to keep a corresponding CoreCLR version around.
Remove workarounds for crossgen bug https://github.com/dotnet/coreclr/issues/9118