test(core): reduce fakeAsync usage in tests

Use async/await where needed. Remove unused dependencies.

Author: SkyZeroZx

packages/core/test/acceptance/authoring/BUILD.bazel

@@ -14,7 +14,6 @@ TEST_DEPS = [
     "//packages/platform-browser:platform-browser",
     "//packages/core/primitives/signals:signals",
     "//:node_modules/rxjs",
-    "//packages/core/test/animation_utils",
     "//packages/private/testing",
 ]