test(core): rename r2-based hello_world and todo bundling tests (#46559)

In the previous commit, the r3-based hello_world and todo tests were deleted
in favor of the r2 versions. This commit renames the r2 versions to drop the
r2 suffix.

PR Close #46559

packages/core/test/bundling/hello_world/treeshaking_spec.ts

@@ -11,7 +11,7 @@ import '@angular/compiler';
 import * as fs from 'fs';
 import * as path from 'path';
 
-const PACKAGE = 'angular/packages/core/test/bundling/hello_world_r2';
+const PACKAGE = 'angular/packages/core/test/bundling/hello_world';
 
 describe('treeshaking with uglify', () => {
   let content: string;

packages/core/test/bundling/todo/BUILD.bazel

@@ -68,7 +68,7 @@ genrule(
 
 ts_devserver(
     name = "devserver",
-    entry_module = "@angular/core/test/bundling/todo_r2",
+    entry_module = "@angular/core/test/bundling/todo",
     scripts = [
         "//tools/rxjs:rxjs_umd_modules",
     ],

packages/core/test/bundling/todo/todo_e2e_spec.ts

@@ -11,7 +11,7 @@ import '@angular/compiler';
 import {withBody} from '@angular/private/testing';
 import * as path from 'path';
 
-const PACKAGE = 'angular/packages/core/test/bundling/todo_r2';
+const PACKAGE = 'angular/packages/core/test/bundling/todo';
 const BUNDLES = ['bundle.js', 'bundle.debug.min.js', 'bundle.min.js'];
 
 describe('functional test for todo', () => {