Cisco Duo Security: Support Information and Metadata Updates

What Changed

Updated Cisco Duo Security solution metadata including support tier designation and offer identification for Content Hub compatibility.

Administrative Updates

Per PR discussion: Updated “tier” field to “Partner” and set offerId to “azure-sentinel-solution-cisco-duo-security” in solution metadata to resolve validation requirements. No functional changes to detection logic or data ingestion.

Affected Files

(packaging artefacts: mainTemplate.json, Solution metadata, SolutionMetadata.json, ReleaseNotes.md)