[ACA-4264] refactor page load and loginWith methods (#1952)

* update extensions json files

* no message

* on login, sign out if anyone is already logged in

* one more selector override needed by ACA-4262

projects/aca-testing-shared/src/components/dialog/select-template-dialog.ts

@@ -41,6 +41,10 @@ export class SelectTemplateDialog extends GenericDialog {
     super('.aca-template-node-selector-dialog');
   }
 
+  get content() {
+    return this.rootElem.element(by.css('.adf-content-node-selector-content'));
+  }
+
   async isCancelButtonEnabled(): Promise<boolean> {
     return isPresentAndEnabled(this.cancelButton);
   }