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CSS: Rename new WPTs for uniqueness

Tests in https://chromium-review.googlesource.com/c/chromium/src/+/2405034
failed CSS-COLLIDING-TEST-NAME, which would block export.



TBR=andruud@chromium.org

Bug: 2405034
Change-Id: I515449b1c52d7c1ee974472e77c2265569a9ddb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417785Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808243}