build: add browser-esbuild test infra

This commit adds browser-esbuild infra.

Author: alan-agius4

packages/angular_devkit/build_angular/BUILD.bazel

@@ -340,6 +340,7 @@ LARGE_SPECS = {
             "@npm//popper.js",
         ],
     },
+    "browser-esbuild": {},
 }
 
 [

packages/angular_devkit/build_angular/src/builders/browser-esbuild/tests/setup.ts

@@ -0,0 +1,32 @@
+/**
+ * @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.io/license
+ */
+
+import { Schema } from '../schema';
+
+export { describeBuilder } from '../../../testing';
+
+export const BROWSER_BUILDER_INFO = Object.freeze({
+  name: '@angular-devkit/build-angular:browser-esbuild',
+  schemaPath: __dirname + '/../schema.json',
+});
+
+/**
+ * Contains all required browser builder fields.
+ * Also disables progress reporting to minimize logging output.
+ */
+export const BASE_OPTIONS = Object.freeze<Schema>({
+  index: 'src/index.html',
+  main: 'src/main.ts',
+  outputPath: 'dist',
+  tsConfig: 'src/tsconfig.app.json',
+  progress: false,
+
+  // Disable optimizations
+  optimization: false,
+  buildOptimizer: false,
+});