Add notes about (not) including screenshots in QA failure issue
What does this MR do?
Screenshots take up a lot of room in an issue and sometimes that's not necessary because all the information the screenshot contains can be included as text. E.g., error 500 or Retry later.
This adds a note about that to the QA failure issue template.
It also notes that you can "hide" screenshots behind a details/summary block, if there's more than one. That can avoid excessive scrolling while still making the information easy to access.