fix(purl): filter recommend report vulns to fixed/not_affected only [Backport release/0.6.z]

[trustify-ci-bot]

Description

Backport of #2727 to release/0.6.z.

Summary by Sourcery

Filter PURL recommendation reports to show only remediated vulnerabilities and exclude packages without an addressable CVE.

Bug Fixes:

• Filter recommendation reports to vulnerabilities addressed by the recommended PURL, including only fixed and not_affected statuses.
• Exclude packages with no fixed or not_affected vulnerabilities from recommendation reports.

Enhancements:

• Align advisory selection and vulnerability counts with addressed vulnerabilities only.

Tests:

• Expand recommendation report coverage for mixed vulnerability statuses and packages with no addressable vulnerabilities.

[sourcery-ai]

Reviewer's Guide

The recommendation report now represents remediation candidates rather than active findings: it includes only CVEs marked fixed or not_affected for the recommended PURL, omits packages with no addressed CVEs, and derives advisory metadata and counts from the filtered set. Endpoint tests were updated and expanded to validate mixed statuses, exclusion behavior, and report counts.

Flow diagram for filtered PURL recommendation vulnerabilities

flowchart TD
    A[Recommended PURL vulnerability advisories] --> B[Select best advisory per vulnerability]
    B --> C{Status is fixed or not_affected?}
    C -->|Yes| D[Include CVE in remediation candidates]
    C -->|No| E[Exclude affected or under_investigation CVE]
    D --> F{Any addressed CVEs?}
    F -->|Yes| G[Derive advisory metadata and counts from filtered set]
    F -->|No| H[Omit package from recommendation report]

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File-Level Changes

Change	Details	Files
Filter recommendation report vulnerabilities to CVEs addressed by the recommended PURL.	Retain only fixed and not_affected vulnerability statuses. Exclude packages with no addressed vulnerabilities. Select the advisory ID from addressed vulnerabilities only.	modules/fundamental/src/purl/service/mod.rs
Update and expand recommendation report coverage for addressed and unaddressed vulnerability statuses.	Revise the existing test to expect fixed/not-affected CVEs. Add mixed-status coverage verifying affected CVEs are omitted and counts are filtered. Add coverage ensuring packages with only affected CVEs are excluded. Add a reusable minimal CSAF VEX fixture builder.	modules/fundamental/src/purl/endpoints/test.rs

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Needs a human reviewer. This changes which CVEs appear in remediation reports, excluding affected or under-investigation vulnerabilities and potentially causing consumers to miss required fixes if the status selection is wrong. Reverting restores the previous report behavior, but remediation decisions made from an incorrect report are not automatically undone.

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