Remove unused /scan_execution_policies internal API
What does this MR do and why?
This MR removes unused internal API that initially we wanted to use to fetch scan execution policies from GitLab to GitLab Agent for Kubernetes.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #341358 (closed)