Get rid of exception traceback printing in asyncio tests (GH-14343)

(cherry picked from commit 549f7d4)

Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>

Author: miss-islington

Lib/test/test_asyncio/test_subprocess.py

@@ -248,8 +248,8 @@ def test_communicate_ignore_broken_pipe(self):
         proc, large_data = self.prepare_broken_pipe_test()
 
         # communicate() must ignore BrokenPipeError when feeding stdin
-        with test_utils.disable_logger():
-            self.loop.run_until_complete(proc.communicate(large_data))
+        self.loop.set_exception_handler(lambda loop, msg: None)
+        self.loop.run_until_complete(proc.communicate(large_data))
         self.loop.run_until_complete(proc.wait())
 
     def test_pause_reading(self):