Cleanup usage of work_item_epic_milestones feature flag (!195530) · Merge requests · GitLab.org / GitLab

What does this MR do and why?

Cleanup usage of work_item_epic_milestones feature flag

Remove usage of the work_item_epic_milestones feature flag now that Milestone widgets are available globally on epic work items.

Changelog: removed

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Related to #538993 (closed)