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Memoize common rules:changes evaluations in pipeline creation

Hordur Freyr Yngvason requested to merge remove-ff-memoized-rules-changes into master

What does this MR do and why?

Improves pipeline creation time for projects where rules:changes are re-used across a large number of job definitions, such as for gitlab-org/gitlab on GitLab.com. Most projects will not notice a difference, as other factors typically dominate the creation time.

This completes the rollout of the feature flag memoized_rules_changes, see #461658 (closed)

Changelog: performance

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