Flaky esm_integration.test_pthread_abort. (#25192)

#25151

Author: juj

test/test_core.py

@@ -2685,6 +2685,7 @@ def test_pthread_attr_getstack(self):
     self.do_run_in_out_file_test('pthread/test_pthread_attr_getstack.c')
 
   @node_pthreads
+  @flaky('flaky specifically in esm_integration suite. https://github.com/emscripten-core/emscripten/issues/25151')
   def test_pthread_abort(self):
     self.set_setting('PROXY_TO_PTHREAD')
     # Add the onAbort handler at runtime during preRun.  This means that onAbort