Revert "Merge branch 'update-test-images' into 'main'"

Now it looks like this change has been reverted? The pil version since the weekend is the same, but the specific build hash is different, so something has changed?!

This reverts merge request !634 (merged)

passed: https://gitlab.esrf.fr/ui/daiquiri/-/jobs/555637 and now failing: https://gitlab.esrf.fr/ui/daiquiri/-/jobs/555917