Python wheel workflow should validate sdist

[cary-ilm]

The python wheel workflow should have a validation step that does a pip install of the wheel, including a pip install --no-binary to verify the build-from-source actually works.

[JeanChristopheMorinPerso]

For reference, here is how it can be done: https://github.com/AcademySoftwareFoundation/MaterialX/blob/main/.github%2Fworkflows%2Fmain.yml#L409-L412