Remove optimistic locking FF for descendants cache

Adam Hegyirequested to merge
remove-optimistic_locking_for_namespace_descendants_cache into master

What does this MR do and why?

This MR removes the optimistic_locking_for_namespace_descendants_cache FF. The flag was enabled by default.

References

Rollout issue: #551832 (closed)

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Merge request reports