Combine wheels-pure-publish and wheels-manylinux-publish

[vyasr]

These two scripts are nearly identical and should be fairly trivial to combine. Currently the only repository making use of the wheels-pure-publish workflow is cudf, and only for dask-cudf. Therefore, I would suggest simply trying to use wheels-manylinux-publish in the dask-cudf workflow, and if that works, switch over the cudf repo to do that and then we can delete the wheels-pure-publish workflow.

Once the two are combined, we should also consider renaming to just wheels-publish.

[shwina]

@wence- and I noticed while working on this that the scripts rapids-twine and rapids-twine-new are essentially the same. We're just going to use rapids-twine-new in the wheels-publish script. Once we've verified that it works for both "manylinux" and "pure" builds, I think we can go ahead and mv rapids-twine-new rapids-twine.

[vyasr]

Yes, those two are essentially the same and I was planning on cleaning that up once the dust settled on the current set of in-progress updates to shared workflows and the containers.

[vyasr]

Completed in #89 and #116