Resolve sync_traversal_ids_nowait feature flag

Alex Pooleyrequested to merge
472155-feature-flag-enable-sync_traversal_ids_nowait into master

What does this MR do and why?

Removes the sync_traversal_ids_nowait feature flag.

The FF has been globally enabled and verified to work.

The FF was first merged in !158024 (merged) and later modified in !162526 (merged).

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Related to #472155 (closed)

Edited by Alex Pooley

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