Gitleaks v8.2.3

What does this MR do?

This MR updates the Secret Detection analyzer dependency on gitleaks to v8.2.0. gitleaks v8.0.0 introduced some big changes including the switch from go-git to shelling git commands directly which ended up being much more performant. Full release notes for gitleaks can be found here: https://github.com/zricethezav/gitleaks/releases

Because of the gitleaks update, there have been some minor changes to the analyzer including:

• the need to extract relative file paths for non-historic scans
• secret struct definition change
• ruleids that are part of the gitleaks configuration file are used for findings' id/compare key
• shelling of gitleaks needed to be tweaked

Other changes include removing some bloated tests that don't accomplish anything like full-history vs small-full-history: https://gitlab.com/gitlab-org/security-products/analyzers/secrets/-/blob/master/convert_test.go#L25-28

What are the relevant issue numbers?

gitlab-org/gitlab#345770 (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
  • Auto-DevOps template
  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer