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>