Show manually imported vulnerability data

[ruromero]

The Trustify Response Handler was relying on the importer label to group the vulnerability data.

                "labels": {
                  "file": "2024/rhsa-2024_1662.json",
                  "importer": "redhat-csaf",
                  "source": "https://security.access.redhat.com/data/csaf/v2/advisories/",
                  "type": "csaf"
                },

When Advisories are uploaded manually they don't have this label and they are therefore excluded from the report.
It is expected that they're grouped in a generic source manual