Remove FF use_related_pipelines_for_policy_evaluation

Martin Cavojrequested to merge
524830-feature-flag-rollout-of-use_related_pipelines_for_policy_evaluation into master

What does this MR do and why?

Remove FF use_related_pipelines_for_policy_evaluation after it was enabled on production for several days.

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Related to #524830 (closed)

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