Revert "Piglit: re-enable flaky tests"
This reverts commit d3224d94.
https://bugs.freedesktop.org/show_bug.cgi?id=104778
Tests continued to be flaky in CI.
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This reverts commit d3224d94.
https://bugs.freedesktop.org/show_bug.cgi?id=104778
Tests continued to be flaky in CI.