Improve the performance of the labels queries
What does this MR do and why?
This MR enables the preload_max_access_levels_for_labels_finder
feature flag. The flag has been enabled on PRD, rollout issue: #390664 (closed)
Performance comparison: #388947 (comment 1328971846)
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.
Related to #388947 (closed)