WIP: Refactor trufflehog module

What does this MR do?

This MR attempts to tackle some of the TODO items found in the trufflehog module which involve breaking out logic in separate smaller functions and reducing complexity.

What are the relevant issue numbers?

Started working on this WIP after diving into gitlab-org/gitlab#33285 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
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  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer