Consistent handling of "abort"/"back" links in forms

[jeriox]

    I must say I find having the Abort Links build inside the form kind of defies the django pattern of having forms reusable. Like that kind of navigation should be part of the view, right?

Originally posted by @felixrindt in https://github.com/ephios-dev/ephios/pull/825#discussion_r1016478912

We should streamline the UX for aborting a form edit in all of ephios.