run-test-jar: Reduce environment passed to tests. am: d7674c2621

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

Change-Id: I6c8f086e1ac50151b02e162f21007007e29a4218
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>