Move wheel install logic into Pex. #2324

Job	Run time
Check GitHub Organization	1s
tox -e format-check,typecheck,vendor-check,package	4m 21s
./dtox.sh -e py27-pip20	27m 34s
./dtox.sh -e py35-pip20	28m 39s
tox -e py312-pip23_3_1	29m 19s
./dtox.sh -e py311-pip20	29m 51s
tox -e py312-pip23_3_1-integration	29m 1s
./dtox.sh -e py311-pip22_3_1	30m 51s
./dtox.sh -e py311-pip23_1_2	30m 36s
./dtox.sh -e py312-pip23_3_1	29m 2s
./dtox.sh -e pypy310-pip20	38m 18s
./dtox.sh -e pypy310-pip22_3_1	40m 8s
./dtox.sh -e pypy310-pip23_1_2	38m 51s
./dtox.sh -e py27-pip20-integration	35m 0s
./dtox.sh -e py37-pip22_3_1-integration	53m 47s
./dtox.sh -e py37-pip23_1_2-integration	53m 28s
./dtox.sh -e py311-pip20-integration	36m 30s
./dtox.sh -e py311-pip22_3_1-integration	43m 40s
./dtox.sh -e py311-pip23_1_2-integration	41m 48s
./dtox.sh -e py312-pip23_3_1-integration	50m 11s
./dtox.sh -e pypy310-pip20-integration	53m 28s
./dtox.sh -e pypy310-pip22_3_1-integration	53m 51s
./dtox.sh -e pypy310-pip23_1_2-integration	53m 48s
Gather Final Status	0s
	13h 52m 3s

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