Extract EE specific files/lines for app/assets/javascripts/pages

We have the following files containing EE specific code. We should move them to ee/

• app/assets/javascripts/pages/groups/issues/index.js
• app/assets/javascripts/pages/milestones/shared/components/promote_milestone_modal.vue
• app/assets/javascripts/pages/projects/project.js
• app/assets/javascripts/pages/projects/edit/index.js
• app/assets/javascripts/pages/projects/issues/form.js
• app/assets/javascripts/pages/projects/issues/index/index.js
• app/assets/javascripts/pages/projects/shared/permissions/components/settings_panel.vue