[org admin - departments] fixup & improvements (#7330)

- improved the UX for 'member item'
- added confirm dialog for 'delete member'
- fixed API & displaying error msgs for adding multiple members
- fixed 'delete repo'
- fixed sorting members ascending by 'role'
- removed 'store the sort way in localStorage'
- removed 'v2' from code & file names

frontend/src/utils/org-admin-api.js

@@ -464,10 +464,12 @@ class OrgAdminAPI {
     return this.req.delete(url);
   }
 
-  orgAdminAddGroupMember(orgID, groupID, userEmail) {
+  orgAdminAddGroupMember(orgID, groupID, emails) {
     const url = this.server + '/api/v2.1/org/' + orgID + '/admin/groups/' + groupID + '/members/';
     let form = new FormData();
-    form.append('email', userEmail);
+    for (let i = 0; i < emails.length; i++) {
+      form.append('email', emails[i]);
+    }
     return this._sendPostRequest(url, form);
   }