Move related issues shared components from EE
With MR https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9730, I did some changes on EE codebase to make Related Issues widget components reusable. I moved them into vue_shared
folder and this MR brings now-vue-shared components to CE.
Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/57662
Edited by Fatih Acet