Add test_format_month_section to test_report.py

[fryerd1]

Pull Request Checklist

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• I have followed RAP best practices (reproducibility, automation, transparency).
• My code follows PEP8 standards and includes comments/docstrings.
• I have added or updated unit tests for new/changed code.
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Description of Changes

Added test for format_month_section in test_report.py

Reviewer Guidance

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[alex-westwood]

Looks good to me. Can you add a couple comments to explain what it is doing, similar to the test below. Otherwise happy to merge

[alex-westwood]

Added a few spaces for formatting but test works and looks good to me. Thanks for adding the comments. Happy to merge