🧪 Implement a end-2-end test for the gitleaks scanner #273

The project had a bug 🐞 regarding the gitleaks scanner because the last major release introduced some braking changes with version 7.x. Since we have no end-2-end test yet it we ran into an unstable situation because our implementations breaks accidentally (see #272 for more background).

For the future it would be better to implement a end-2-end test for the gitleaks scanner to identify such problems earlier.

Context:

• Find the gitleak implementation here: https://github.com/secureCodeBox/secureCodeBox/tree/main/scanners/gitleaks
• Implement a end-2-end test here: https://github.com/secureCodeBox/secureCodeBox/tree/main/tests/integration/scanner