Add explicit warning when an overlap is detected

[rgmz]

Description:

Similar to #2922, the goal of this change is to provide clear and actionable information if a detection is impacted.

The problem is currently that "verification overlap" doesn't provide useful feedback. Even if you use --results=unknown to see the error, it doesn't tell you which detectors overlapped.

2024-06-06T08:27:05-04:00       info-0  trufflehog      WARNING: A result will not be verified because more than one detector matches. You can override this behavior by using the --allow-verification-overlap flag    {"verification_overlap_worker_id": "2hlPu", "detectors": ["AzureSearchAdminKey", "AzureDevopsPersonalAccessToken"]}

Checklist:

• [x] Tests passing (make test-community)?
• [x] Lint passing (make lint this requires golangci-lint)?