Add group::code review as the code owner for app/models/concerns/issuable.rb

Duo Developerrequested to merge
duo/feature/583068-add-issuable-to-codeowners into master

As part of the incident prompting this FCL gitlab-org#20163, it was identified that the changes to the file app/models/concerns/issuable.rb should have been flagged for approval by groupcode review.

Related to #583068

Edited by Abdul Wadood

Merge request reports