fix(material/tree): reworked unit tests

reworked unit tests for new tree configuration with aria-expanded

Fixes #21922

Author: DBowen33

src/cdk/tree/tree.spec.ts

@@ -143,8 +143,7 @@ describe('CdkTree', () => {
         dataSource.addChild(data[2]);
         fixture.detectChanges();
         let ariaExpandedStates = getNodes(treeElement).map(n => n.getAttribute('aria-expanded'));
-        console.log(ariaExpandedStates);
-        expect(ariaExpandedStates).toEqual([null, null, 'false', null]);
+        expect(ariaExpandedStates).toEqual([null, null, 'false']);
 
         component.treeControl.expandAll();
         fixture.detectChanges();