Skip SVG processing if no window/document or SVG support.

[jamessimo]

In edge cases where BabylonJS is being ran in a Windowless/DOM-less environment, creation of images fails due to the "Check SVG" requiring a DOM to work. Just added a catch to find if you don't have a window and return the same value.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Snapshot stored with reference name:
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To test a playground add it to the URL, for example:

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[bjsplat]

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[bjsplat]

Visualization tests for WebGPU

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[bjsplat]

WebGL2 visualization test reporter:

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[bjsplat]

Visualization tests for WebGPU

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