Remove purge_stale_security_findings feature flag
What does this MR do and why?
This FF was ops type but we've decided to remove it as the functionality behind that feature was working stable.
Related to [Feature flag] purge_stale_security_findings (#356464 - closed).
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.