After the initial suppression the bot started failing on the next test.
Use GTEST_SKIP in testSetUp to make all tests using the fixture skipped.

Bug: chromium:1097750
Change-Id: Ic993d7cd274e1328684571c5ba1a1520b9cb80d5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2270020Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>