WT-11217 introduced call based array traversal for the session array. This has worked well and provides a single mechanism to walk the session array. This change removed ~6 or so unique session array walk implementations and enabled the correct ordering and statistic guarantees to be upheld without introducing a significant amount of overhead.

We should implement the same thing for the txn_shared_list walk as it has the same issues as the session array.

Scope:

• Implement callback based txn_shared_list walking