This reverts commit 0b1856bfe3.
This broke one of our clients projects where a local libary could no
longer be found. Since there is no easy way to disable it's better
if this flag is set per project using `dotnetRestoreFlags`.
This should speed up restore times a fair bit, especially for bigger
projects. Roslyn also has it enabled by default already, so I don't
expect any breakages from it.
This is a much more flexible way of doing things, as we can adopt and
reuse these hooks for various tasks. Syntax highlighting now also works
way better for me, which is a nice bonus :)
