fix: add `originalFilename` to emitted asset to correct the `manifest.json`

[riw]

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• [ ] I have written new tests, as applicable (for bug fixes / features)

• [ ] Docs have been added / updated (for bug fixes / features)

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• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) currently, only the last version of several conversions of an image with the same name is noted in manifest.json. this change adds an entry for each image.

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[changeset-bot[bot]]

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Latest commit: b231c54395f703b168e17f57d197c0b1e0a2e679

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