Update types,textures and bgra8unorm_storage tests

[shrekshao]

Failing in chrome, related chrome impl update: https://dawn-review.googlesource.com/c/dawn/+/178923

• Fix storage_texture_types for bgra8unorm test (force it to pass instead of relying on storage info from format_info)
• Remove create_shader_module_with(out)_bgra8unorm_storage
• Add sampled_texture_types

---

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.

[jrprice]

LGTM, although in future I'd recommend splitting unrelated changes into separate PRs (e.g. bgra8unorm stuff and sampled texture tests would be two different PRs) .