build: rename shims_for_IE.js -> shims_for_internal_tests.js (#43002)

This commit renames shims_for_IE.js -> shims_for_internal_tests.js, since there are no IE shims there anymore (there are still shims for older Safari and Android versions).

PR Close #43002

BUILD.bazel

@@ -24,7 +24,7 @@ filegroup(
         "//packages/zone.js/bundles:zone-testing.umd.js",
         "//packages/zone.js/bundles:task-tracking.umd.js",
         "//:test-events.js",
-        "//:third_party/shims_for_IE.js",
+        "//:third_party/shims_for_internal_tests.js",
         # Including systemjs because it defines `__eval`, which produces correct stack traces.
         "@npm//:node_modules/systemjs/dist/system.src.js",
         "@npm//:node_modules/reflect-metadata/Reflect.js",

karma-js.conf.js

@@ -50,7 +50,7 @@ module.exports = function(config) {
 
       // Including systemjs because it defines `__eval`, which produces correct stack traces.
       'test-events.js',
-      'third_party/shims_for_IE.js',
+      'third_party/shims_for_internal_tests.js',
       'node_modules/systemjs/dist/system.src.js',
 
       // Serve polyfills necessary for testing the `elements` package.

packages/router/karma.conf.js

@@ -28,7 +28,7 @@ module.exports = function(config) {
       // Polyfills.
       'node_modules/core-js/client/core.js',
       'node_modules/reflect-metadata/Reflect.js',
-      'third_party/shims_for_IE.js',
+      'third_party/shims_for_internal_tests.js',
 
       // System.js for module loading
       'node_modules/systemjs/dist/system-polyfills.js',

third_party/shims_for_internal_tests.js

@@ -1,4 +1,4 @@
-// This file is used for internal testing with Karma only, it should not be used in real applications.
+// IMPORTANT: this file is used for internal testing with Karma only, it **must not** be used in real applications.
 
 // Intl (all Safari, all Android)
 /*! @source https://github.com/andyearnshaw/Intl.js */