Fix undefined names in automated_benchmarking.py

Fix undefined names in automated_benchmarking.py

Fix variable name typos in automated_benchmarking.py

% `ruff check`
```
Error: tests/automated_benchmarking.py:237:21: F821 Undefined name `baseline_label`
Error: tests/automated_benchmarking.py:250:21: F821 Undefined name `baseline_label`
Error: tests/automated_benchmarking.py:318:55: F821 Undefined name `frequenc`
Error: Process completed with exit code 1.
```
% [`ruff rule F821`](https://docs.astral.sh/ruff/rules/undefined-name)