WIP: maybe necessary clip_distance testing for max_inter_stage_shader_variables?

Author: ErichDonGubler

cts_runner/test.lst

@@ -179,6 +179,7 @@ webgpu:shader,execution,flow_control,return:*
 // Many other vertex_buffer_access subtests also passing, but there are too many to enumerate.
 // Fails on Metal in CI only, not when running locally.
 fails-if(metal) webgpu:shader,execution,robust_access_vertex:vertex_buffer_access:indexed=true;indirect=false;drawCallTestParameter="baseVertex";type="float32x4";additionalBuffers=4;partialLastNumber=false;offsetVertexBuffer=true
+webgpu:shader,execution,shader_io,vertex_builtins:outputs,clip_distances:*
 webgpu:shader,validation,const_assert,const_assert:*
 webgpu:shader,validation,expression,binary,short_circuiting_and_or:array_override:op="%26%26";a_val=1;b_val=1
 webgpu:shader,validation,expression,binary,short_circuiting_and_or:invalid_types:*