run-test-jar: Reduce environment passed to tests. am: d7674c2621 am: 4661bcb7bf am: 42b29b7c3b

Original change: https://android-review.googlesource.com/c/platform/art/+/2240694

Change-Id: I93be42f54cf399898efe756c936c0eecdadc314f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>