Migrate dependency list header to use latest_ingested_sbom_pipeline

What does this MR do and why?

This removes a dependency on Security::ReportFetchService and allows us to link to a pipeline instead of a job. This is ideal because a pipeline might have multiple SBoM jobs and we ingest all of them.

Relates to: #463358 (closed)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Go to the dependency list page for a project which has dependencies
2. Verify that latest successful scan link points to a pipeline instead of a build.