[WebGPU] Queue should not allow command buffer to be committed twice

https://bugs.webkit.org/show_bug.cgi?id=273585
<radar://127364831>

Reviewed by Cameron McCormack.

Check the command buffer status during validation to ensure
addCompleted / scheduled handler doesn't occur after commit.

* LayoutTests/TestExpectations:
* LayoutTests/fast/webgpu/fuzz-273585-expected.txt: Added.
* LayoutTests/fast/webgpu/fuzz-273585.html: Added.
Add regression test.

* Source/WebGPU/WebGPU/Queue.mm:
(WebGPU::Queue::errorValidatingSubmit const):

Canonical link: https://commits.webkit.org/278362@main

LayoutTests/TestExpectations

@@ -2116,6 +2116,8 @@ webkit.org/b/139639 [ Debug ] cssom/non-subpixel-scroll-top-left-values.html [ S
 [ Release ] fast/webgpu/fuzz-273503.html [ Pass Failure Timeout ]
 [ Debug ] fast/webgpu/fuzz-273578.html [ Skip ]
 [ Release ] fast/webgpu/fuzz-273578.html [ Pass Failure Timeout ]
+[ Debug ] fast/webgpu/fuzz-273585.html [ Skip ]
+[ Release ] fast/webgpu/fuzz-273585.html [ Pass Failure Timeout ]
 
 # Imported W3C HTML/DOM ref tests that are failing.
 imported/w3c/web-platform-tests/html/dom/elements/global-attributes/dir_auto-textarea-script-N-between-Rs.html [ ImageOnlyFailure ]