Add logic for known issues lookup

[miguelgonrod]

This change makes known_issues explicitly support the disabled status and use specific script to retreive all types of opened issues, now disabled known issues can be queried through the same helper interface used for open issues. This improves consistency in how known issues are retrieved and ensures disabled entries can be included in filtering and reporting flows.

Changes

• Updated known_issues to handle the disabled status explicitly.
• Routed disabled issue lookups through the dedicated SQL query for disabled known issues.
• Improved downstream known-issue filtering/reporting behavior by allowing disabled issues to be retrieved through the shared helper path.

Considerations

This change is mainly meaningful at the helper/API level in buildfarm_tools.rb, since it defines how other flows access disabled known issues. Its behavior still depends on the underlying SQL query returning the intended set of disabled records, so both layers should remain aligned.

This script is part of https://github.com/osrf/buildfarm-tools-private/pull/69

[Crola1702]

LGTM