Poor project validation

There are issues in the project validation when working with the new meta packages.

1. When only the Windows platform is installed in the editor you get the message 'Build target (unknown) is not supported'
This should say something about windows and android development and maybe provide a fix. This also hinders all PCVR development

2. 'Disable Graphics Jobs' seems like bad advice to me. It was broken on older versions, but now it can give a performance boost, which is definitely welcome. For windows Graphics jobs never had an issue