fix(menu): resolve aborted animations as false rather than reject

fixes #5638

PiperOrigin-RevId: 642044142

menu/internal/menu.ts

@@ -770,20 +770,18 @@ export abstract class Menu extends LitElement {
    */
   private animateClose() {
     let resolve!: (value: unknown) => void;
-    let reject!: () => void;
 
     // This promise blocks the surface position controller from setting
     // display: none on the surface which will interfere with this animation.
-    const animationEnded = new Promise((res, rej) => {
+    const animationEnded = new Promise((res) => {
       resolve = res;
-      reject = rej;
     });
 
     const surfaceEl = this.surfaceEl;
     const slotEl = this.slotEl;
 
     if (!surfaceEl || !slotEl) {
-      reject();
+      resolve(false);
       return animationEnded;
     }
 
@@ -870,7 +868,7 @@ export abstract class Menu extends LitElement {
         animation.cancel();
         child.classList.toggle('md-menu-hidden', false);
       });
-      reject();
+      resolve(false);
     });
 
     surfaceHeightAnimation.addEventListener('finish', () => {