Merge #1042

1042: Remove windows from CI r=matklad a=matklad

We don't actually look at the CI results for windows anyway!

In general, rust-analyzer should be written in a completely
OS-independent way. That is, testing on one OS should be enough. If
this is not the case, that means something is seriously broken.

No doubt there are components which actually talk to the outside
world, and they may be platform dependent. We should extract such
components to a separate repo with an extensive multi platform CI,
like we did for VFS

Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>