FPASF-143: fix download report

[gidsg]

Change description

The download reporting mechanism was broken by the refactoring in: 025cf8f

This PR

• Restores the request_type key that was removed
• Makes the logs query backwards compatible so we can retrieve the logs using the refactored format
• Adds a unit test to make this interface harder to break in future

• Unit tests and other appropriate tests added or updated
• README and other documentation has been updated / added (if needed)
• Commit messages are meaningful and follow good commit message guidelines (e.g. "FS-XXXX: Add margin to nav items preventing overlapping of logo")

How to test

Script should return results for recent period e.g. python3 ./scripts/extract_download_logs.py -e dev -m 1 (with dev AWS credentials.)

Screenshots of UI changes (if applicable)