Draft: Enable push_rule_ordered_by_id FF by default
What does this MR do and why?
Contributes to #559013
This feature flag enforces the ordering by ID for duplicated push rules.
The feature flag is enabled on GitLab.com since 2025-08-12.
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.
Related to #559013