Unset variables related to the Bazel testing environment in the subprocess. #1463
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Unset variables related to the Bazel testing environment in the subprocess.
Most of these variables set locations for various kinds of testing outputs. When
running a testing binary in a subprocess, we don't want want any such output.
All we care about is collecting STDOUT and STDERR.
I also unset variables related to the test shards using the new unsetting
mechanism.
#Centipede