fix: fix for #531

[thejustinwalsh]

Description of change

Generates a failing test for issue #531
Potential fix for #531; please modify or review as necessary.

Fixes: #531

Pre-Merge Checklist

• Tests and/or benchmarks are included
• Documentation is changed or added
• Lint process passed (npm run lint)
• Tests passed (npm run test)

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[thejustinwalsh]

@trezy 'handles subsequent loads' is failing in the way that is described in #531. I'll be out for the next few days, so I won't have time to research further at the moment, hope this test helps.

[thejustinwalsh]

I took a crack at a fix, and the failing test I submitted is now passing. I attempted to make the test more robust as well.
I also simplified the SSR code path here, but it may be more straightforward to unwind that change.

The key to my fix is to use the resolved assets if they are already resolved by the time an additional hook is called.

However, we may need a better test that validates that the texture has the correct data and does not simply return a default texture instance. This could potentially be verified via the width and height of the texture being mocked to something specific, and for good fun, increasing the timeout delay for resolving the promise in createImageBitmap.