Fix raft-dask naming in wheel builds

[divyegala]

Before https://github.com/rapidsai/raft/pull/1804/files, we were using raft-dask and raft_dask interchangeably because they were hardcoded. Since the package name is now capture as a variable, it's a bug to use raft_dask as the pyproject name does not get updated correctly and we end up publishing raft-dask wheels without cu{version} suffixes

[vyasr]

This change mostly aligns with the fix we discussed, but I think you may have changed one too many places and you're going to run into some minor issues because of the way that some names get normalized. In particular, I think that the wheel names (like the actual filename) will still use raft_dask instead of raft-dask because that's the pip convention (convert hyphens to underscores). I could be wrong, but CI should reveal this for me. If you can test locally that might help you get through it faster so that you don't have to wait for pylibraft.

[divyegala]

/merge