Clean up `scan_execution_policy_cache_ci_templates` feature flag

Dominic Bauerrequested to merge
469693-feature-flag-rollout-of-scan_execution_policy_cache_ci_templates-removal into master

What does this MR do and why?

Cleans up the scan_execution_policy_cache_ci_templates feature flag (#469693 (closed)) introduced by !157781 (merged).

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Related to #469693 (closed)

Edited by Dominic Bauer

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