Fix test_locate_file_abspath_esm to use dynamic import for path module

The test was using require('path') which doesn't work in ESM mode.
Since ESM output (.mjs) wraps the module in an async context, we can
use top-level await with dynamic import.

Changed from:
  require('path')['isAbsolute'](scriptDirectory)

To:
  var nodePath = await import('node:path');
  nodePath.isAbsolute(scriptDirectory)

This properly tests the Node.js path.isAbsolute() function while being
compatible with ESM module format. The CJS variant (test_locate_file_abspath)
continues to use require() as appropriate for CommonJS.

Author: Bartek Wrona

test/test_other.py

@@ -15166,9 +15166,11 @@ def test_locate_file_abspath(self, args):
   })
   def test_locate_file_abspath_esm(self, args):
     # Verify that `scriptDirectory` is an absolute path when `EXPORT_ES6`
+    # Use dynamic import for path module since ESM output supports top-level await
     create_file('pre.js', '''
+      var nodePath = await import('node:path');
       Module['locateFile'] = (fileName, scriptDirectory) => {
-        assert(require('path')['isAbsolute'](scriptDirectory), `scriptDirectory (${scriptDirectory}) should be an absolute path`);
+        assert(nodePath.isAbsolute(scriptDirectory), `scriptDirectory (${scriptDirectory}) should be an absolute path`);
         return scriptDirectory + fileName;
       };
       ''')