Have resolve test test more formats.

[greggman]

---

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 in the test tree.
• Test descriptions allow a reader to "read only the test plans and evaluate coverage completeness", and accurately reflect the test code.
• Tests provide complete coverage (including validation control cases). Missing coverage MUST be covered by TODOs.
• Helpers and types promote readability and maintainability.

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

[greggman]

CQ run 🤞

[greggman]

note: there a large list of TODOs in this file.

For example, I'd expect it's possible that resolving to a slice of a 3d texture is broken somewhere. I started to try to add that but it was going to be a bit of work. This was a smaller change.

[beaufortfrancois]

LGTM

[beaufortfrancois]

CQ is not happy sadly ;(

[greggman]

sadly those appear to be real driver bugs :(