**Apache Airflow version**:

2.1.0

**Environment**:

- self hosted docker-compose based stack

**What happened**:

Using JDBCOperator if the sql result in an error we got only 
```
[2021-06-21 11:05:55,377] {local_task_job.py:151} INFO - Task exited with return code 1
```

Before upgrading from 2.0.1 we got error details in logs:
```
jaydebeapi.DatabaseError: java.sql.SQLException:... [MapR][DrillJDBCDriver](500165) Query execution error. Details: VALIDATION ERROR:...
``` 

**What you expected to happen**:

See `SQLException` in logs

**How to reproduce it**:

Perform a generic SQL task with broken SQL.

**Anything else we need to know**:

I think is somehow related to https://github.com/apache/airflow/commit/abcd48731303d9e141bdc94acc2db46d73ccbe12#diff-4fd3febb74d94b2953bf5e9b4a981b617949195f83d96f4a589c3078085959b7R202 
airflow/models/taskinstance.py
"""Executes Task (optionally with a Timeout) and pushes Xcom results"""
        
        
        if task_copy.execution_timeout:
            try:
                with timeout(task_copy.execution_timeout.total_seconds()):
                    result = task_copy.execute(context=context)
            except AirflowTaskTimeout:
                task_copy.on_kill()
                raise
        else:
            result = task_copy.execute(context=context)
        
        if task_copy.do_xcom_push and result is not None:
            self.xcom_push(key=XCOM_RETURN_KEY, value=result)
        return result
    def _run_execute_callback(self, context: Context, task):
        """Functions that need to be run before a Task is executed"""
        try:
            if task.on_execute_callback:
                task.on_execute_callback(context)
        except Exception:
            self.log.exception("Failed when executing execute callback")
    def _run_finished_callback(self, error: Optional[Union[str, Exception]] = None) -> None: