Problem
WiredTiger currently supports slow truncate of leader mode. However more work is needed to enable fast truncate. There are two pathways for each truncate can be called. One with table: uri, in this case we call table_truncate() which performs slow truncate. We need to check whether layered: follows the same behaviour.

What needs to be done
After WT-15207 has been merged in, a POC fast truncate will be created in the develop branch, showcasing a basic working fast truncate functionality on primary nodes. The ticket will focus on reviewing and finalising the POC fast truncate implementation. This ticket should also re-enable all python fast truncate tests and triage/fix them,.