Revert "Timeout the test run before go/ab timeout to capture test info"

Needs go/art-buildbot fixes, for example:
https://build.chromium.org/p/client.art/builders/bullhead-armv8-gcstress-debug/builds/42/steps/test%20optimizing/logs/stdio

The timings look odd too: all the tests pass in a few seconds. Or maybe we don't print / it's hard to find the one that is taking a long time?

This reverts commit ef9f3cb8.

Change-Id: I34cb46c5c5e2dacc0c6414d5ea1003ffa1d22101