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What? Why?
Follow up from #6014. The main scripts in that PR are not needed any more but I extracted a few tweaks that should improve code style and catch some edge cases.
All commits in this PR have been reviewed before. So I'll skip review and put this straight into test-ready.
What should we test?
Upload a product image and verify that it displays in the shop.
Release notes
Changelog Category: Technical changes
Image maintenance scripts are more robust now.