Add generateViewEvent() util to generate stats in e2e tests. Refactored xsrf.interceptor.ts to move constants to a separate file so they can be reused in e2e tests easily.

src/app/core/auth/server-auth-request.service.spec.ts

@@ -8,7 +8,7 @@ import { PostRequest } from '../data/request.models';
 import {
   XSRF_REQUEST_HEADER,
   XSRF_RESPONSE_HEADER
-} from '../xsrf/xsrf.interceptor';
+} from '../xsrf/xsrf.constants';
 
 describe(`ServerAuthRequestService`, () => {
   let href: string;