build: update angular-in-memory-web-api to work with ESM (#48521)

Properly imports `jasmine-ajax` instead of attempting to load
some CommonJS bundle as a bootstrap dependency in Karma.

PR Close #48521

packages/misc/angular-in-memory-web-api/test/BUILD.bazel

@@ -20,14 +20,6 @@ ts_library(
 
 karma_web_test_suite(
     name = "test_web",
-    # do not sort
-    bootstrap = [
-        "@npm//:node_modules/core-js-bundle/index.js",
-        "@npm//:node_modules/reflect-metadata/Reflect.js",
-        "@npm//:node_modules/jasmine-ajax/lib/mock-ajax.js",
-        "//packages/zone.js/bundles:zone.umd.js",
-        "//packages/zone.js/bundles:zone-testing.umd.js",
-    ],
     deps = [
         ":test_lib",
     ],

packages/misc/angular-in-memory-web-api/test/http-client-backend-service_spec.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-/// <reference types="jasmine-ajax" />
+import 'jasmine-ajax';
 
 import {HTTP_INTERCEPTORS, HttpBackend, HttpClient, HttpClientModule, HttpEvent, HttpEventType, HttpHandler, HttpInterceptor, HttpRequest, HttpResponse} from '@angular/common/http';
 import {Injectable} from '@angular/core';