Compat: Make compat tests run on core and expect to pass

This helps validate the tests are doing something that is supposed to pass on core but fail on compat.

This refactor found one bug in createTexture where it was failing because it was asking for a depthOrArrayLayers = 6 1D texture

Note:

the shader_module tests don't pass in compat on chrome yet (waiting for implementation)
the interpolate tests fail on core nor compat as support for first and either needs to be added.

Requirements for PR author:

[X] All missing test coverage is tracked with "TODO" or .unimplemented().
[X] New helpers are /** documented */ and new helper files are found in helper_index.txt.
[X] Test behaves as expected in a WebGPU implementation. (If not passing, explain above.)
[X] 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.

gpuweb / cts