Add machinery to generate test-only wheels. #17434
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PR Summary
Generate a matplotlib.tests wheel that can be uploaded to PyPI as a separate PyPI package ("distribution", in distutils parlance), to make it possible to install tests and test data from PyPI.
This is useful e.g. for mplcairo, whose test suite relies on matplotlib's one.
Also, useful for Baseline image problem optimisation.
Co-authored-by: @anntzer
Closes #11732
Thanks