open-200: support .stp and .step URLs

[pablo-mayrgundter]

Demo:

https://deploy-preview-1198--bldrs-share.netlify.app/share/v/gh/bldrs-ai/test-models/main/step/zoo.dev/a-gear.step

Percy https://percy.io/8fe2b2f1/share/builds/34513539

Diffs:

• First 2 gear ones are from new test case names, one each for .stp and .step
• Not sure why Open 100 has no prior. I recently changed the way we get base images, so maybe let's just note and approve these for a bit
• There's jitter in a few below, plus a little change in notes that should have been picked up in that pr

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