Ensure that the PEX_ROOT is always a realpath. (#2626) #3279

Job	Run time
Check GitHub Organization	1s
tox -e format-check,lint-check,typecheck,enum-check,vendor-check,package,docs	11m 31s
tox -e py313-pip24_3_1	13m 12s
tox -e py313-pip24_3_1-integration --shard 1/2	28m 47s
./dtox.sh -e py27-pip20	9m 52s
tox -e py313-pip24_3_1-integration --shard 2/2	28m 38s
./dtox.sh -e py38-pip22_3_1	17m 34s
./dtox.sh -e py311-pip23_3_2	18m 35s
./dtox.sh -e py313-pip24_3_1	14m 42s
./dtox.sh -e py314-pip24_3_1	15m 3s
./dtox.sh -e pypy310-pip24_3_1	27m 46s
./dtox.sh -e py27-pip20-integration	29m 0s
./dtox.sh -e py38-pip22_3_1-integration --shard 1/2	30m 7s
./dtox.sh -e py38-pip22_3_1-integration --shard 2/2	28m 50s
./dtox.sh -e py311-pip23_3_2-integration --shard 1/2	30m 10s
./dtox.sh -e py311-pip23_3_2-integration --shard 2/2	29m 23s
./dtox.sh -e py313-pip24_3_1-integration --shard 1/2	27m 10s
./dtox.sh -e py313-pip24_3_1-integration --shard 2/2	27m 10s
./dtox.sh -e py314-pip24_3_1-integration --shard 1/2	29m 29s
./dtox.sh -e py314-pip24_3_1-integration --shard 2/2	26m 43s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 1/2	48m 0s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 2/2	49m 37s
Gather Final Status	1s
	9h 1m 21s

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