fix(suse): incompatibility between old clients and new servers due to OS identifier change

[knqyf263]

Description

The recent change to normalize OS identifiers (as part of #7965 and commit 45d3b40) has introduced an incompatibility issue between older Trivy clients and newer Trivy servers. Older clients send OS identifiers in the old format (e.g., with dots), while newer servers only accept the normalized format (e.g., with dashes). This prevents older clients from working correctly with updated servers.

This issue tracks the work to restore backward compatibility by allowing servers to accept both the old and new OS identifier formats. This will ensure that the server update does not break existing Trivy deployments.