Add admin organizations list view

.../javascripts/admin/organizations/index/components/app.vue

...zations/index/graphql/queries/organizations.query.graphql

app/assets/javascripts/admin/organizations/index/index.js

...assets/javascripts/organizations/index/components/app.vue

...ganizations/shared/components/list/organizations_list.vue

...ations/shared/components/list/organizations_list_item.vue

...ts/organizations/shared/components/organizations_view.vue

app/assets/stylesheets/page_bundles/organizations.scss

app/helpers/organizations/organization_helper.rb

app/views/admin/organizations/index.html.haml

doc/administration/admin_area.md

doc/user/organization/index.md

...sets/javascripts/pages/admin/organizations/index/index.js

locale/gitlab.pot

...frontend/admin/organizations/index/components/app_spec.js

spec/frontend/organizations/index/components/app_spec.js

...ns/shared/components/list/organizations_list_item_spec.js

...zations/shared/components/list/organizations_list_spec.js

...rganizations/shared/components/organizations_view_spec.js

spec/frontend/organizations/shared/mock_data.js