Exceptions in task logs no longer contain source code

### Apache Airflow version

3.0.6

### If "Other Airflow 2 version" selected, which one?

_No response_

### What happened?

**Updated with better example**

Airflow 3 no longer captures all the lines from an Exception. It seems like it displays part of the traceback but not the actual lines of code. This makes debugging difficult.

### What you think should happen instead?

_No response_

### How to reproduce

```python
from datetime import datetime

from airflow import DAG
from airflow.operators.python import PythonOperator

default_args = {
"owner": "airflow",
"depends_on_past": False,
"start_date": datetime(2021, 6, 18),
"retries": 0,
}

def failing_python_function():
print("Things are going well!")
raise Exception("Down bad rn")

def nested_function():
failing_python_function()

def nested_function_2():
nested_function()

with DAG(
"test_error",
default_args=default_args,
schedule=None,
catchup=False,
) as dag:
PythonOperator(
task_id="run_entrypoint",
python_callable=nested_function_2,
)

```

### Operating System

Debian

### Versions of Apache Airflow Providers

_No response_

### Deployment

Astronomer

### Deployment details

_No response_

### Anything else?

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

Reproduce the problem with the provided DAG and compare the Airflow 3 task log with the expected traceback, including its source lines. Trace the task-log and exception-rendering entry points; done means the complete traceback shows the relevant source-code lines for nested Python task failures.

Written by the indexing model from the issue text.