Auto merge of #13992 - anholt:webgl-old-subtest-fails, r=glennw

webgl: Remove some expected-fails from subtests that have been fixed.

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Removes expected-fails from subtests that have been fixed, to reduce the diff for ./mach update --ignore-existing.  That command is useful to be able to run on webgl testing, since we're often fixing a few subtests at a time, and all of this debris made finding your actual test changes hard

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [X] These changes do not require tests because it's just test metadata

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These tests all used to fail overall, and have notes about which
subtests were failing so that an overall failure could still show up
as no regressions.  Since then, all of the subtests have been fixed,
and their overall statuses updated, but we can also garbage collect
the subtests at this point.

This was produced by doing ./mach update --ignore-existing from a
webgl conformance run, and pulling out everything that completely
removed a file that didn't have expected overall failure.

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