[TEST] Add unit tests for log_audit function

[arumes31]

I implemented comprehensive unit tests for the log_audit function in hookwise/utils.py.
The tests cover various scenarios:

1. No request context (System user)
2. Session-based username
3. Basic Authentication username
4. Custom database session and commit=False flag.

Additionally, I updated tests/conftest.py to include a global autouse fixture that mocks Redis across the application. This was necessary to fix a pre-existing ConnectionRefusedError in the performance tests and to ensure the test suite can run in environments without a Redis server.

All 44 tests in the suite are now passing.

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PR created automatically by Jules for task 4733576918003444612 started by @arumes31

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