Remove Pex runtime scrubbing dist discovery. (#2290) #2311

Job	Run time
Check GitHub Organization	1s
tox -e format-check,typecheck,vendor-check,package	4m 21s
tox -e py312-pip23_3_1	21m 24s
./dtox.sh -e py27-pip20	11m 40s
tox -e py312-pip23_3_1-integration	2h 9m 35s
./dtox.sh -e py35-pip20	13m 51s
./dtox.sh -e py311-pip20	14m 48s
./dtox.sh -e py311-pip22_3_1	15m 12s
./dtox.sh -e py311-pip23_1_2	16m 37s
./dtox.sh -e py312-pip23_3_1	15m 31s
./dtox.sh -e pypy310-pip20	28m 29s
./dtox.sh -e pypy310-pip22_3_1	27m 56s
./dtox.sh -e pypy310-pip23_1_2	28m 0s
./dtox.sh -e py27-pip20-integration	19m 29s
./dtox.sh -e py37-pip22_3_1-integration	44m 48s
./dtox.sh -e py37-pip23_1_2-integration	42m 55s
./dtox.sh -e py311-pip20-integration	26m 6s
./dtox.sh -e py311-pip22_3_1-integration	30m 45s
./dtox.sh -e py311-pip23_1_2-integration	30m 43s
./dtox.sh -e py312-pip23_3_1-integration	36m 11s
./dtox.sh -e pypy310-pip20-integration	46m 14s
./dtox.sh -e pypy310-pip22_3_1-integration	58m 26s
./dtox.sh -e pypy310-pip23_1_2-integration	57m 50s
Gather Final Status	1s
	12h 0m 53s

Provide feedback