Distinguish between two files have the same name but a different extension

If this is merged after ✨ Do not regenerate the avif file each time it is requested Needs work , the MR will need to be updated so that Avif::getAvifCopy() uses $destination = $this->getAvifDestination($uri, '@directory@filename.@extension.avif'); to get the destination.

Sorry, this is a duplicate of 🐛 Filename conflict Fixed .