CI: simplify steps for using in-repo please_pex tool (#267) #813

Job	Run time
Test (Python 3.13, in-repo please_pex) / Run tests	1m 2s
Test (Python 3.11, in-repo please_pex) / Run tests	1m 6s
Test (Python 3.12, in-repo please_pex) / Run tests	1m 22s
Test (Python 3.14, in-repo please_pex) / Run tests	1m 17s
Test (Python 3.14, stable please_pex release) / Run tests	50s
Test (Python 3.9, in-repo please_pex) / Run tests	1m 6s
Test (Python 3.10, in-repo please_pex) / Run tests	1m 14s
Test (Python 3.11, stable please_pex release) / Run tests	39s
Test (Python 3.9, stable please_pex release) / Run tests	38s
Test (Python 3.10, stable please_pex release) / Run tests	40s
Test (Python 3.12, stable please_pex release) / Run tests	42s
Test wheel_resolver (Python 3.13) / Run tests	10s
Test wheel_resolver (Python 3.12) / Run tests	11s
Test wheel_resolver (Python 3.14) / Run tests	18s
Test wheel_resolver (Python 3.9) / Run tests	13s
Test wheel_resolver (Python 3.10) / Run tests	11s
Test wheel_resolver (Python 3.11) / Run tests	7s
Test (Python 3.13, stable please_pex release) / Run tests	42s
Release wheel_resolver	11s
Release plugin	5s
Release please_pex	1m 54s
	14m 38s

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