Give swizzle assignment cases names and update listing_meta.json

[sudonatalie]

Modify the swizzle assignment tests to give them named cases (to satisfy the name length requirements failing on the bots), and update listing_meta.json to add some recently introduced tests that weren't included

---

Requirements for PR author:

• All missing test coverage is tracked with "TODO" or .unimplemented().
• New helpers are /** documented */ and new helper files are found in helper_index.txt.
• Test behaves as expected in a WebGPU implementation. (If not passing, explain above.)
• Test have be tested with compatibility mode validation enabled and behave as expected. (If not passing, explain above.)

Requirements for reviewer sign-off:

• Tests are properly located.
• Test descriptions are accurate and complete.
• Tests provide complete coverage (including validation control cases). Missing coverage MUST be covered by TODOs.
• Tests avoid over-parameterization (see case count report).

When landing this PR, be sure to make any necessary issue status updates.

[github-actions]

Results for build job (at e479eec):

 Test case/subcase counts did not change.

[kainino0x]

Hm, it's failing the test query name length check...
Take a look at the error but if it's not easy to deal with, then I think it's OK to just leave these out for now.
I'll look into whether we still need this metadata at all.

Error: Generated test variant would produce too-long -actual.txt filename. Possible solutions:
  - Reduce the length of the parts of the test query
  - Reduce the parameterization of the test
  - Make the test function faster and regenerate the listing_meta entry
  - Reduce the specificity of test expectations (if you're using them)
|<------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------>|
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"u32","vecSize":4,"initial":[1,2,3,5],"swizzle":"xy","rhs":"vec2u(6,%207)","expected":[6,7,3,5]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"u32","vecSize":4,"initial":[6,7,3,5],"swizzle":"zx","rhs":"vec2u(8,%209)","expected":[9,7,8,5]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"u32","vecSize":4,"initial":[1,1,1,1],"swizzle":"xyzw","rhs":"vec4u(10,%2011,%2012,%2013)","expected":[10,11,12,13]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"u32","vecSize":4,"initial":[10,11,12,13],"swizzle":"xy","rhs":"vec2(v.y,%20v.x)","expected":[11,10,12,13]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"i32","vecSize":3,"initial":[-10,-20,-30],"swizzle":"y","rhs":"-50","expected":[-10,-50,-30]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"i32","vecSize":3,"initial":[10,20,30],"swizzle":"zx","rhs":"vec2i(40,%2060)","expected":[60,20,40]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"f32","vecSize":3,"initial":[1,2,3],"swizzle":"xy","rhs":"vec2f(4.0,%205.0)","expected":[4,5,3]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"f32","vecSize":2,"initial":[1,2],"swizzle":"yx","rhs":"v%20%2B%20v","expected":[4,2]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"f32","vecSize":4,"initial":[10,20,30,100],"swizzle":"rgb","rhs":"vec3f(v.r,%20v.g,%20v.b)%20%2F%2010","expected":[1,2,3,100]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"f16","vecSize":2,"initial":[1,2],"swizzle":"yx","rhs":"vec2h(4.0,%205.0)","expected":[5,4]};*
webgpu:shader,execution,statement,swizzle_assignment:swizzle_assignment_local_var:case={"elemType":"bool","vecSize":3,"initial":[1,1,1],"swizzle":"xz","rhs":"vec2%3Cbool%3E(false,%20false)","expected":[0,1,0]};*

[kainino0x]

Filed #4592

[sudonatalie]

Thanks, I think that is actually a valuable error to come up even if it's in an odd roundabout way here. Gave the cases some names.

[kainino0x]

LGTM!