[ADF-3569] Add tests for task list demo page: (#3810)

* [ADF-3438] Add tests for task list demo page:

* Fixing some tests

* Added new tests

* Add more tests

* Fix the name of the test for bamboo

* Fix test name to work on bamboo

* no message

* Added new tests

* Modified the error message.

* no message

* fix lint issues

* Fix lint issues

* Changing taskListSinglePage from js to ts

* Uncomment a test

* Fixing lint issues

* Solve lint error

* Refactored taskListDemoPage

* Commented two tests that are failing because of a bug in APS

* Fix lint error

* Resolved comments

e2e/pages/adf/process_services/tasksListPage.js

@@ -29,7 +29,7 @@ var TasksListPage = function () {
         return dataTable;
     };
 
-    this.checkTaskListIsLoaded = function () {
+    this.checkTaskListIsLoaded = function() {
         Util.waitUntilElementIsVisible(taskList);
         return this;
     };