Rewrite wheel_resolver tests to run under unittest (#264) #809

Job	Run time
Test (Python 3.10, in-repo please_pex) / Run tests	1m 12s
Test (Python 3.9, in-repo please_pex) / Run tests	50s
Test (Python 3.11, in-repo please_pex) / Run tests	49s
Test (Python 3.14, in-repo please_pex) / Run tests	1m 2s
Test (Python 3.12, in-repo please_pex) / Run tests	52s
Test (Python 3.13, in-repo please_pex) / Run tests	51s
Test wheel_resolver (Python 3.10) / Run tests	13s
Test wheel_resolver (Python 3.9) / Run tests	12s
Test wheel_resolver (Python 3.12) / Run tests	12s
Test wheel_resolver (Python 3.11) / Run tests	9s
Test wheel_resolver (Python 3.13) / Run tests	12s
Test wheel_resolver (Python 3.14) / Run tests	18s
Test (Python 3.10, stable please_pex release) / Run tests	39s
Test (Python 3.9, stable please_pex release) / Run tests	36s
Test (Python 3.12, stable please_pex release) / Run tests	46s
Test (Python 3.11, stable please_pex release) / Run tests	41s
Test (Python 3.13, stable please_pex release) / Run tests	40s
Test (Python 3.14, stable please_pex release) / Run tests	55s
Release wheel_resolver	10s
Release plugin	6s
Release please_pex	2m 0s
	13m 25s

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