Create security finding enrichment join table

Imam Hossainrequested to merge
516814-associate-cve-enrichment-data-with-security-findings into master

What does this MR do and why?

Create security_finding_enrichments table to link security findings to CVE enrichment data. This establishes a many-to-many relationship between Security::Finding and PackageMeta:CveEnrichment models, enabling detailed CVE information for security findings.

Changelog: added

References

Spike MR: #581332 (comment 2962097562)

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How to set up and validate locally

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