Fix memory leak on loadImage failure

[gfrancine]

A follow-up to PR #8937, which resolved #8921. (I got an OK from @ksen0 for this follow-up after a discussion on Discord!)

Changes:

• Revoke the blob object URL used by loadImage on an image loading error, which is previously only cleaned up on a successful load.
• Added tests for ensuring all URL objects are properly cleaned up during loadImage regardless of implementation.

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated

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