Revert "fix(router): process empty path segment when preceding a named outlet (#26243)" (#27516)

This reverts commit 20cef5078d.

Breaks Pantheon see cl/224256517.

PR Close #27516

packages/router/test/recognize.spec.ts

@@ -263,20 +263,6 @@ describe('recognize', () => {
         });
       });
 
-      it('should work with children outlets', () => {
-        checkRecognize(
-            [{
-              path: '',
-              component: ComponentA,
-              children: [{path: 'b', outlet: 'b', component: ComponentB}]
-            }],
-            '(b:b)', (s: RouterStateSnapshot) => {
-              checkActivatedRoute((s as any).firstChild(s.root) !, '', {}, ComponentA);
-              checkActivatedRoute(
-                  (s as any).firstChild((s as any).firstChild(s.root)) !, 'b', {}, ComponentB, 'b');
-            });
-      });
-
       it('should match when terminal', () => {
         checkRecognize(
             [{path: '', pathMatch: 'full', component: ComponentA}], '',