WASM Tests Unsupported on WebGPU

[cwfitzgerald]

Currently our tests rely on the ability to wait for gpu work to be finished. This is accessible through a mistake of an API on WebGL, but synchronous waiting is not supported with webgpu.

In order for our tests to work on WebGPU, we will need to make them, at least in part, asynchronous. Another possible solution is to execute them in a web worker via wasm-thread which works out of the box.

[cwfitzgerald]

#3873 now allows asynchronous tests, we still need to convert the tests to utilize the asynchronousness.