Add unit tests for mod_report

[ay-bh]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Currently, there is no automated testing in place to validate the functionalities of the mod_report module.

Issue Number: N/A

What is the new behavior?

This PR introduces a series of unit tests aimed at validating the correctness and reliability of the mod_report module. The tests cover several key functionalities:

• Processing profile traffic to determine if the captured data is sufficient for report generation.
• Ignoring files that do not meet the minimum size requirements for processing.
• Generating HTML reports from processed traffic data, including handling of session data for report generation.
• Ensuring compatibility with expected inputs and outputs, and verifying the correct generation of PDF documents from HTML reports.

Other information

Run pytest tests/test_mod_report.py from the project root directory to check.

Please ensure you have all dependencies needed to simulate mod_report.py installed using pip, for reference please check mod_report/requirements.txt