Fix deprecated `attribute_changed?`
The following discussion from !9386 (closed) should be addressed:
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@jprovaznik started a discussion: (+1 comment) This check is used both in before and after callbacks - do we need a separate check (which uses
saved_change...
for after callback?
Another place is https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9386/diffs#note_138288244.
There might be more places requiring a change, the reason is that attribute_changed?
has been deprecated in 5.1 so before upgrade to 5.2 we should fix all places where we use it.