Add operation test on the creation of pipeline layout with null bind group layout

[Jiawei-Shao]

Issue: #4075

---

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.

[jiangzhaoming]

As a note, Jiawei is working on fixing issue caught by the test.

[kainino0x]

Fixed: #4075

Do we still need to fix the tests suppressed in https://dawn-review.googlesource.com/c/dawn/+/220534 or are they fixed already?
(Not that we'll probably forget about them, but good to keep an issue open if work still needs to be done.)

[kainino0x]

LGTM aside from testing empty bind groups

[Jiawei-Shao]

Fixed: #4075

Do we still need to fix the tests suppressed in https://dawn-review.googlesource.com/c/dawn/+/220534 or are they fixed already? (Not that we'll probably forget about them, but good to keep an issue open if work still needs to be done.)

Yes. I'll fix them in the next patch.

[jiangzhaoming]

Looks good to me, thanks!