Allow syncing work items to legacy epics

Nicolas Dularrequested to merge
nd/remove-prevening-syncing-epic-to-work-item into master

What does this MR do and why?

Allow syncing work items to legacy epics

Removes the work_item_epics feature flag check on the policy when a work item has a synced epic.

We always want to sync epic work item changes back to the legacy epic. We also want to use the work item services first and then write to the legacy epic, regardless of the feature flag state.

Therefore we should no longer prevent it based on the feture flag.

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