Feat/uepr 238 sanitize svgs on open #251
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Resolves
https://scratchfoundation.atlassian.net/browse/UEPR-238
Proposed Changes
Reuse SVG sanitization logic for opening SVGs
Reason for Changes
Currently we load SVGs directly into the DOM, without extensive sanitization. We do use DOMPurify, but it doesn't catch all places where a link might be attached/loaded. We already have more extensive logic in
sanitizeSvgText, used on costume upload, which we can reuse for loading already uploaded svgs as well.