Draft: Resolve "Remove the `Security::PipelineVulnerabilitiesFinder` class"

What does this MR do and why?

The issue Remove the Security::PipelineVulnerabilitiesFinder class appears to have a long and storied history.

As a new member to groupthreat insights, this part of the codebase is brand new to me. Trying to trace through the history without being familair with the code beng discussed wasn't helping me.

Instead, I know the ultimate goal is to delete Security::PipelineVulnerabilitiesFinder, so I'm going to see what breaks after doing that, and work backwards from there

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Related to #334488