Move several py3- packages to pip-build-install, add tests. #26917
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I set out to get rid of SETUPTOOLS_SCM_PRETEND_VERSION, and found some issues along the way.
replace any packages that had SETUPTOOLS_SCM_PRETEND_VERSION with py/pip-build-install.
Add tests to touched packages
Drop 'python3' runtime dep from touched packages - melange sca does the right thing.
py3-cppy - add setuptools dep, found when adding a test.
py3-gcloud-aio-storage - Fix uninstallable paackage which conflicted with its dependency py3-gcloud-aio-auth. they both provided usr/lib/python3.12/site-packages/gcloud/py.typed
py3-maturin - Fix the provides in py3-maturin-bin packages to provide py3-maturin-bin rather than just py3-maturin. That fixes py3-pendulum which was failing to build because it actually needs 'maturin' executable but that was not being provided by the 'py3-maturin' dep.
py3-pendulum - fix dependency it should be tzdata not pytzdata
py3-pytzdata - Drop this, it is not used anywhere.
Note the 'python3' shell snippet in py3-rich and others is painful. See #26818 for more context.