We have screenshot tests that basically negate the need for this,
and when we're doing more complicated things we tend to use
videos anyway which aren't caught by this check.
Now we have a CODEOWNERS file a reviewer is assigned automatically,
so there's no need for this.
It also misfires a bunch (maybe if there are no _pending_ reviewers
because they've already reviewed?), so removing it fixes that noise.
Make danger check view changes
Add a check that if a file with @Preview or @LargeHeightPreview
in it is changed, then the corresponding build file includes
the showkase processor.
Also change the check that prompts about screenshots to use
the same @Preview logic instead of checking for "/layout" in
the path which doesn't work with compose.
Also add missing showkase processors