Issue
We suspect data loss can occur when sweeping a layered dhandle is supposed to be drained during step up. This was identified following the investigation in WT-16703.

The root cause is sweeping layered dhandles during concurrent draining. WT-16974 will implement the short term fix. WT-16982 will be used to investigate a longer term solution.

Work to be done
This ticket looks into the long term solution for WT-16974. The ticket will need to focus on these areas:

• Tie the lifetime of a layered dhandle to its ingest dhandle.
• Ensure layered dhandle and data inside ingest tables are not closed in follower mode and step-up process.