Relocate environment variable injection to before the interpreter is run #2292

Job	Run time
Check GitHub Organization	1s
./dtox.sh -e py27-pip20	15m 3s
./dtox.sh -e py35-pip20	18m 0s
tox -e format-check,typecheck,vendor-check,package	4m 11s
tox -e py312-pip23_3_1	21m 56s
./dtox.sh -e py311-pip20	19m 41s
./dtox.sh -e py311-pip22_3_1	20m 44s
tox -e py312-pip23_3_1-integration	50m 45s
./dtox.sh -e py311-pip23_1_2	20m 37s
./dtox.sh -e py312-pip23_3_1	19m 2s
./dtox.sh -e pypy310-pip20	28m 24s
./dtox.sh -e pypy310-pip22_3_1	48m 51s
./dtox.sh -e pypy310-pip23_1_2	33m 16s
./dtox.sh -e py27-pip20-integration	29m 57s
./dtox.sh -e py37-pip22_3_1-integration	1h 33m 16s
./dtox.sh -e py37-pip23_1_2-integration	39m 40s
./dtox.sh -e py311-pip20-integration	21m 34s
./dtox.sh -e py311-pip22_3_1-integration	27m 24s
./dtox.sh -e py311-pip23_1_2-integration	1h 5m 3s
./dtox.sh -e py312-pip23_3_1-integration	34m 43s
./dtox.sh -e pypy310-pip20-integration	1h 7m 34s
./dtox.sh -e pypy310-pip22_3_1-integration	52m 33s
./dtox.sh -e pypy310-pip23_1_2-integration	1h 23m 46s
Gather Final Status	1s
	13h 36m 2s

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