Enable and remove the FF ci_rule_exists_extension_optimization
What does this MR do and why?
Enable and remove the FF ci_rule_exists_extension_optimization
gitlab-com/gl-infra/production#17531 (closed)
It's already enabled on GitLab.com since 2024-03-05.
The feature flag was added in !143056 (merged).
Changelog: performance
MR acceptance checklist
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Edited by Peter Leitzen