Fixes:#17054
add core updater directory permission check, before the update copy file is over. Update some Failed screenshots as well.
This issue is in "needs review" but there has been no activity for 7 days. ping @matomo-org/core-reviewers
@sgiehl trying to think of a test, any suggestion?
Adding a test for that one was actually a bit harder than I expected. But I managed to add an UI test for it.