Remove generic trigger cancelled error log (#33874)

We tried to address #31720 in PR #31757. The issue talked about
adding a trigger cancelled log when trigger timesout, but we also
added a generic Trigger canceled log. This log appears even in
successful runs of the triggers when they finish. This is confusing
some users as the log level is Error and there are sometimes quite
a few log lines saying "Trigger cancelled; err=" with giving no
clue as to what is happening.
So, I am removing this generic error log line and we can add specific
cancel scenarios with detailed reasons when we implement those.

airflow/jobs/triggerer_job_runner.py

@@ -607,12 +607,11 @@ async def run_trigger(self, trigger_id, trigger):
                 self.log.info("Trigger %s fired: %s", self.triggers[trigger_id]["name"], event)
                 self.triggers[trigger_id]["events"] += 1
                 self.events.append((trigger_id, event))
-        except asyncio.CancelledError as err:
+        except asyncio.CancelledError:
             if timeout := trigger.task_instance.trigger_timeout:
                 timeout = timeout.replace(tzinfo=timezone.utc) if not timeout.tzinfo else timeout
                 if timeout < timezone.utcnow():
                     self.log.error("Trigger cancelled due to timeout")
-            self.log.error("Trigger cancelled; message=%s", err)
             raise
         finally:
             # CancelledError will get injected when we're stopped - which is