**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
if use_default:
            jinja_context = {'ti': self}
            
            
            jinja_context.update(
                dict(
                    exception=exception,
                    exception_html=exception_html,
                    try_number=self.try_number - 1,
                    max_tries=self.max_tries,
                )
            )
            jinja_env = jinja2.Environment(
                loader=jinja2.FileSystemLoader(os.path.dirname(__file__)), autoescape=True
            )
            subject = jinja_env.from_string(default_subject).render(**jinja_context)
            html_content = jinja_env.from_string(default_html_content).render(**jinja_context)
            html_content_err = jinja_env.from_string(default_html_content_err).render(**jinja_context)
        else:
            jinja_context = self.get_template_context()
            jinja_context.update(
                dict(
                    exception=exception,
                    exception_html=exception_html,
                    try_number=self.try_number - 1,
                    max_tries=self.max_tries,
                )
            )
            jinja_env = self.task.get_template_env()
            def render(key, content):