Merge branch 'jej-24637-move-issue-visible_to_user-to-finder' into 'security'

app/finders/issues_finder.rb

app/models/concerns/milestoneish.rb

app/models/issue.rb

...leased/jej-24637-move-issue-visible_to_user-to-finder.yml

features/steps/group/milestones.rb

features/steps/shared/authentication.rb

spec/finders/issues_finder_spec.rb

spec/models/issue_spec.rb

spec/models/milestone_spec.rb