[test] Add test of rollup using node in test_other. NFC (emscripten-core#23708)

This complements the existing browser test in `test_browser.py`.

Author: sbc100

test/rollup_node/index.mjs

@@ -0,0 +1,5 @@
+import Module from './hello.mjs';
+
+await Module();
+
+console.log('done');

test/rollup_node/rollup.config.mjs

@@ -0,0 +1,7 @@
+export default {
+  input: 'index.mjs',
+  output: {
+    file: 'bundle.mjs',
+    format: 'es'
+  }
+};

test/test_other.py

@@ -15697,3 +15697,10 @@ def test_late_module_api_assignment(self):
       create_file('post.js', f'Module.{prop} = () => console.log("will never fire since assigned too late")')
       expected = f"Aborted(Attempt to set `Module.{prop}` after it has already been processed.  This can happen, for example, when code is injected via '--post-js' rather than '--pre-js')"
       self.do_runf(test_file('hello_world.c'), expected, emcc_args=['--post-js=post.js', '-sWASM_ASYNC_COMPILATION=0'], assert_returncode=NON_ZERO)
+
+  def test_rollup(self):
+    shutil.copytree(test_file('rollup_node'), 'rollup_node')
+    with common.chdir('rollup_node'):
+      self.run_process([EMCC, test_file('hello_world.c'), '-sEXPORT_ES6', '-sEXIT_RUNTIME', '-sENVIRONMENT=node', '-sMODULARIZE', '-o', 'hello.mjs'])
+      self.run_process(shared.get_npm_cmd('rollup') + ['--config'])
+      self.assertContained('hello, world!', self.run_js('bundle.mjs'))