Test clip-distances feature

[dneto0]

The spec change has landed. gpuweb/gpuweb#4588

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Particular things to test:

• maxInterStageShaderVariables

[kainino0x]

We should make sure to carefully test the rules around maxInterStageShaderVariables. I am working on gpuweb/gpuweb#4688 and the rule for clip_distances says that it consumes 1-2 @locations at the end, not just uses 1-2 variables from the limit (compare with "point-list" which uses 1 from the limit but doesn't use any @locations).

See existing test:

cts/src/webgpu/api/validation/render_pipeline/inter_stage.spec.ts

Line 253 in 6c58a19

g.test('max_shader_variable_location')