Add tests for WGPU_ARRAY_SLICE_UNDEFINED and friends.

[Kangz]

I'm seeing this one test webgpu:api,validation,render_pass,render_pass_descriptor:color_attachments,depthSlice,definedness:dimension="2d" fail in dawn.node because the UNDEFINED values in webgpu.h is not handled, however dawn.node doesn't handle any of the UNDEFINED values, so the other tests should fail as well.