Add validation tests on the limit of max vertex output location with …

[Jiawei-Shao]

…clip_distances

This patch adds the validation tests on the limit of max vertex output location with clip_distances. According to the WebGPU SPEC, the maximum vertex output location will be decreased by (align(clipDistancesArraySize, 4) / 4) when clip_distances is used.

Fixed: #3773

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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.

[jzm-intel]

Looks good to me, thanks