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Remove feature flags related to FF merge trains

Hordur Freyr Yngvason requested to merge remove-ff-merge-train-flags into master

What does this MR do and why?

This removes the flags merge_trains_create_ref_service and fast_forward_merge_trains_support, which controlled the rollout of fast-forward and semi-linear merge trains. Both flags have been enabled everywhere since 16.5.

The compatibility code paths should be removed at some point, but we leave them in for now to ensure a smooth upgrade from any 16.x to 17.x.

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