This isn't used anywhere in the CTS. All of the tools are run through ts-node which does this compilation in-memory.

However we can't land this yet because there are external things (at least, in Chrome) that use this build.
They will have to be reconfigured to use the out build.

The difference is out uses ES Modules (import), while out-node uses CommonJS (require).

Issue: None

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.)

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.