Fix test harness running disabled tests. Adds special handling for the DISABLED_ GTest test name. Fixes the test for the test suite harness itself when run with the new "--bot-mode" flag. Bug: angleproject:3162 Change-Id: Idf34098d2d6bcb78263773be7b01c55df9ec624b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1998660 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>