Remove Node.js self.run_js() test in browser suite. (#25473)

Remove Node.js self.run_js() test in browser suite. The browser suite
should test browser behavior only.

I am running the browser suite with

```
EMCC_CFLAGS= -sMIN_CHROME_VERSION=-1 -sMIN_SAFARI_VERSION=-1 -sMIN_NODE_VERSION=-1
```

to verify that targeting Firefox only should correctly result in a build
that works in Firefox.

The test `test_hello_world_worker` is the only one that failed. Which
happens because that test also verifies behavior in node.js.

Reading the test logic in that test, it seems to verify the file
packager and `emscripten_run_script()` logic. That logic should be well
covered in the `core` test suites and the `other` test suite already, so
this seems redundant.

Author: juj

.circleci/config.yml

@@ -1095,7 +1095,6 @@ jobs:
     executor: focal
     environment:
       EMTEST_LACKS_WEBGPU: "1"
-      EMTEST_SKIP_NODE_CANARY: "1"
     steps:
       - run-tests-chrome:
           title: "browser64_4gb"

test/test_browser.py

@@ -1617,12 +1617,6 @@ def test_hello_world_worker(self, file_data):
     self.assertExists('worker.js')
     self.run_browser('main.html', '/report_result?hello from worker, and :' + ('data for w' if file_data else '') + ':')
 
-    # code should run standalone too
-    # To great memories >4gb we need the canary version of node
-    if self.is_4gb():
-      self.require_node_canary()
-    self.assertContained('you should not see this text when in a worker!', self.run_js('worker.js'))
-
   @no_wasmfs('https://github.com/emscripten-core/emscripten/issues/19608')
   def test_mmap_lazyfile(self):
     create_file('lazydata.dat', 'hello world')