Revert "feat(core): add support for using async/await with Jasmine" (#25096)

This reverts commit f6829aba55e07609e312b4f67dbc9dbbf36e4e46.

PR Close #25096

packages/core/testing/src/jasmine_await.ts

@@ -1,34 +0,0 @@
-/**
- * @license
- * Copyright Google Inc. 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.io/license
- */
-
-/**
- * Converts an `async` function, with `await`, into a function which is compatible with Jasmine test
- * framework.
- *
- * For asynchronous function blocks, Jasmine expects `it` (and friends) to take a function which
- * takes a `done` callback. (Jasmine does not understand functions which return `Promise`.) The
- * `jasmineAwait()` wrapper converts the test function returning `Promise` into a function which
- * Jasmine understands.
- *
- *
- * Example:
- * ```
- * it('...', jasmineAwait(async() => {
- *   doSomething();
- *   await asyncFn();
- *   doSomethingAfter();
- * }));
- * ```
- *
- */
-export function jasmineAwait(fn: () => Promise<any>):
-    (done: {(): void; fail: (message?: Error | string) => void;}) => void {
-  return function(done: {(): void; fail: (message?: Error | string) => void;}) {
-    fn().then(done, done.fail);
-  };
-}

packages/core/testing/src/testing.ts

@@ -13,7 +13,6 @@
  */
 
 export * from './async';
-export * from './jasmine_await';
 export * from './component_fixture';
 export * from './fake_async';
 export * from './test_bed';