Implement Integration Tests for Email and Username Reputation Checkers

[H4ppy-04]

Description: Add integration tests to ensure the Email and Username Reputation Checkers are working together as expected.

• Write integration tests for the email_reputation_checker and username_reputation_checker modules in the Email and Username directories respectively
• Ensure the email_reputation_checker.py script runs without error and is properly validating email reputations
• Ensure the username_reputation_checker.py script runs without error and is properly validating username reputations
• Verify that the breach_checker module in the Common directory is properly checking for breaches
• Add the integration label to this issue