**Apache Airflow version**: 2.x including main

**What happened**:

I am using an `execution_date_fn` in an `ExternalTaskSensor` that also sets `allowed_states=['success']` and `failed_states=['failed']`. When one of the N upstream tasks fails, the sensor will hang forever in the `poke` method because there is a bug in checking for failed_states.

**What you expected to happen**:

I would expect the `ExternalTaskSensor` to fail.

I think this is due to a bug in the `poke` method where it should check if `count_failed > 0` as opposed to checking `count_failed == len(dttm_filter)`. I've created a fix locally that works for my case and have submitted a PR #16205 for it as reference.

**How to reproduce it**:

Create any `ExternalTaskSensor` that checks for `failed_states` and have one of the external DAGs tasks fail while others succeed.

E.g.
```
ExternalTaskSensor(
        task_id='check_external_dag',                                                     
        external_dag_id='external_dag',                                                               
        external_task_id=None,                              
        execution_date_fn=dependent_date_fn,
        allowed_states=['success'],
        failed_states=['failed'],                                                                     
        check_existence=True)
```

count_failed = self.get_count(dttm_filter, session, self.failed_states)
        if count_failed == len(dttm_filter):
            if self.external_task_ids:
                if self.soft_fail:
                    raise AirflowSkipException(
                        f"Some of the external tasks {self.external_task_ids} "
                        f"in DAG {self.external_dag_id} failed. Skipping due to soft_fail."
                    )
                raise AirflowException(
                    f"Some of the external tasks {self.external_task_ids} "
                    f"in DAG {self.external_dag_id} failed."
                )
            elif self.external_task_group_id:
                if self.soft_fail:
                    raise AirflowSkipException(
                        f"The external task_group '{self.external_task_group_id}' "
                        f"in DAG '{self.external_dag_id}' failed. Skipping due to soft_fail."
                    )
                raise AirflowException(
                    f"The external task_group '{self.external_task_group_id}' "
                    f"in DAG '{self.external_dag_id}' failed."
                )
            else:
                if self.soft_fail:
                    raise AirflowSkipException(
                        f"The external DAG {self.external_dag_id} failed. Skipping due to soft_fail."
                    )
                raise AirflowException(f"The external DAG {self.external_dag_id} failed.")
        return count_allowed == len(dttm_filter)
    def _check_for_existence(self, session) -> None: