Replace arbitrary wait in attachBehaviorsAfterAjaxing with an occurence based one

I merged in 🐛 Image can only be replaced one time before "add media" stops working Active to speed things along, but ideally there should be a test to ensure this doesn't regress. Adding a test to ensure the media can be replaced multiple times in a row should be a requirement of this MR.

Tests added in 📌 Media library e2e should include multiple media replacements Active

Is this arbitrary wait impacting the "Remove" button in the media widget too? I'm running into a problem where the "Remove" button doesn't work on an occasion.