Skip tests that are expected to fail in both Stylo and Gecko modes. They would unexpectedly "pass" in styloVsGecko mode when comparing the two failures, which is not a useful result.
MozReview-Commit-ID: 3mOpjU225Q1
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extra : rebase_source : 0c307639c3626af3b6b43e05d3ee73d08b3f47ce