Remove group hieararchy optimization FF

Adam Hegyirequested to merge
ah-remove-group_hierarchy_optimization into master

What does this MR do and why?

Remove group hieararchy optimization FF

This change removes the group_hierarchy_optimization feature flag.

References

Rollout issue: [Feature flag] Rollout of `group_hierarchy_opti... (#437604 - closed)

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Edited by Adam Hegyi

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