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-actions.e2e.ts

@@ -15,8 +15,7 @@
  * limitations under the License.
  */
 
-import {
-    ApiService,
+import { createApiService,
     BrowserActions,
     BrowserVisibility,
     FileBrowserUtil,
@@ -40,7 +39,7 @@ describe('Version component actions', () => {
     const versionManagePage = new VersionManagePage();
     const navigationBarPage = new NavigationBarPage();
     const uploadDialog = new UploadDialogPage();
-    const apiService = new ApiService();
+    const apiService = createApiService();
     const usersActions = new UsersActions(apiService);
     const viewerPage = new ViewerPage();