test(core): reduce fakeAsync usage in animation tests

Use async/await in animation acceptance tests and share the animation frame helper. Remove the obsolete fakeAsync frame utility and its Bazel dependency.

packages/core/test/acceptance/BUILD.bazel

@@ -27,7 +27,6 @@ ts_project(
         "//packages/core/primitives/signals",
         "//packages/core/src/di/interface",
         "//packages/core/src/util",
-        "//packages/core/test/animation_utils",
         "//packages/core/test/render3:matchers",
         "//packages/core/testing",
         "//packages/localize",

packages/core/test/animation_utils/BUILD.bazel

@@ -1,14 +0,0 @@
-load("//tools:defaults.bzl", "ts_project")
-
-package(default_visibility = ["//visibility:public"])
-
-ts_project(
-    name = "animation_utils",
-    testonly = True,
-    srcs = [
-        "tick_animation_frames.ts",
-    ],
-    deps = [
-        "//packages/core/testing",
-    ],
-)

packages/core/test/animation_utils/tick_animation_frames.ts

@@ -1,14 +0,0 @@
-/**
- * @license
- * Copyright Google LLC All Rights Reserved.
- *
- * Use of this source code is governed by an MIT-style license that can be
- * found in the LICENSE file at https://angular.dev/license
- */
-
-import {tick} from '@angular/core/testing';
-
-/** Ticks the specified amount of `requestAnimationFrame`-s. */
-export function tickAnimationFrames(amount: number) {
-  tick(16.6 * amount); // Angular turns rAF calls into 16.6ms timeouts in tests.
-}

packages/private/testing/src/browser_utils.ts

@@ -9,6 +9,11 @@
 import {ɵgetDOM as getDOM} from '@angular/common';
 import {NgZone} from '@angular/core';
 
+/** Waits for callbacks queued for the next animation frame to run. */
+export function nextAnimationFrame(): Promise<void> {
+  return new Promise((resolve) => requestAnimationFrame(() => resolve()));
+}
+
 export function dispatchEvent(element: any, eventType: any): Event {
   const evt: Event = getDOM().getDefaultDocument().createEvent('Event');
   evt.initEvent(eventType, true, true);