Test uninitialized queries in unsubmitted command buffers

[greggman]

Query slots that have never been used at required to resolve to zero. Some implementations might wrongly mark them as used at encoding time instead of submit time.

These pass on some implementations but it could be by luck of the just happen to be zero

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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.
• Test descriptions are accurate and complete.
• Tests provide complete coverage (including validation control cases). Missing coverage MUST be covered by TODOs.
• Tests avoid over-parameterization (see case count report).

When landing this PR, be sure to make any necessary issue status updates.

[github-actions]

Results for build job (at 702ebb4):

+webgpu:api,operation,command_buffer,queries,occlusionQuery:occlusion_query,unsubmitted_render_pass:* - 1 cases, 1 subcases (~1/case)
+webgpu:api,operation,command_buffer,queries,timestampQuery:resolve_unused_slots:* - 2 cases, 2 subcases (~1/case)
-TOTAL: 280761 cases, 2322100 subcases
+TOTAL: 280764 cases, 2322103 subcases