Refactor e2e's ApiService (#7101)

* Refactor e2e's ApiService

* Fix bits here and there

* [ci:force] Remove unused imports

* [ci:force] Extract shared part from adf-testing

* [ci:force] Extract StringUtils as well

* Make protractor's Logger not have duplicated code

* [ci:force]

e2e/content-services/upload/version-permissions.e2e.ts

@@ -16,8 +16,7 @@
  */
 
 import { browser, by, element } from 'protractor';
-import {
-    ApiService,
+import { createApiService,
     LoginPage,
     NotificationHistoryPage,
     StringUtil,
@@ -50,7 +49,7 @@ describe('Version component permissions', () => {
     const managerUser = new UserModel();
     const fileCreatorUser = new UserModel();
 
-    const apiService = new ApiService();
+    const apiService = createApiService();
     const usersActions = new UsersActions(apiService);
     const nodesApi = new NodesApi(apiService.getInstance());