[pinpoint] enable python3 test on handlers/new
[pinpoint] enable python3 test on handlers/new

Bug: chromium:1120195
Change-Id: I0378871206ff04f6d4fd67bfbc152ce1c88e8293
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/3790478
Reviewed-by: John Chen <334fbfbb4df7c78f091ea1b77c69ca6ac731a3f3@chromium.org>
Commit-Queue: Wenbin Zhang <45ad8a1ff616a38a2202fd35571df81897c5f14f@google.com>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult