Don't log exceptions for every non-200 response (#15969)

Introduced in #15913

Author: erikjohnston

changelog.d/15969.feature

@@ -0,0 +1 @@
+Allow configuring the set of workers to proxy outbound federation traffic through via `outbound_federation_restricted_to`.

synapse/http/server.py

@@ -327,10 +327,6 @@ async def _async_render_wrapper(self, request: "SynapseRequest") -> None:
             # of our stack, and thus gives us a sensible stack
             # trace.
             f = failure.Failure()
-            logger.exception(
-                "Error handling request",
-                exc_info=(f.type, f.value, f.getTracebackObject()),
-            )
             self._send_error_response(f, request)
 
     async def _async_render(