Simplify TestLoad test

What does this MR do?

This MR simplifies the tests added by Override custom sast rules if SECURE_ENABLE_LOC... (!38 - merged) • Schmil Monderer • 17.2.

What are the relevant issue numbers?

Prevent project-level SAST/SD/IaC config files ... (gitlab-org/gitlab#414732 - closed) • Schmil Monderer • 17.3

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 updated/added for this feature/bug
• Job definition updated, if necessary
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• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer