A big +1 to this topic and I like many of the changes suggested 
This ties in with something I’ve been thinking about. Having automation running actual user workflows on an actual foreman/katello instance on the PR level would help give confidence to reviewers when merging PRs.
I find myself repeating the same workflows very often when reviewing PRs.
We have improved our testing infrastructure quite a bit and I think there is more of a possiblity to run something similar to bats testing on the PR level. I know there is talk of UI automation as well. These are bigger changes that require more discussion and I know there are limitations, but I think it would improve PR merge velocity in addition to the changes being discussed.