fix(bazel): flat module misses AMD module name on windows (#27839)

* Fixes that the flat module out files do not have a proper AMD module name on Windows. This is currently blocking serving a `ng_module` using the Bazel TypeScript `devserver` on Windows.

PR Close #27839

packages/bazel/test/ngc-wrapped/flat_module/BUILD.bazel

@@ -0,0 +1,16 @@
+load("//tools:defaults.bzl", "ng_module")
+
+package(default_visibility = ["//packages/bazel/test:__subpackages__"])
+
+ng_module(
+    name = "flat_module",
+    srcs = [
+        "export.ts",
+        "index.ts",
+    ],
+    module_name = "flat_module",
+    tsconfig = ":tsconfig.json",
+    deps = [
+        "//packages/core",
+    ],
+)

packages/bazel/test/ngc-wrapped/flat_module/export.ts

@@ -0,0 +1,9 @@
+/**
+ * @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
+ */
+
+export const Test = 'This is a test export';

packages/bazel/test/ngc-wrapped/flat_module/index.ts

@@ -0,0 +1,9 @@
+/**
+ * @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
+ */
+
+export * from './export';

packages/bazel/test/ngc-wrapped/flat_module/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "compilerOptions": {
+    "skipLibCheck": true,
+    "types": []
+  }
+}