This is part of WT-8663, but it needs a separate ticket since it's a separate pull request.

With the long-term goal of making WiredTiger more easily unit-testable, one of the biggest blockers is the number of functions that need a full-blown session pointer passed in.

Extracting this out and having those functions take only the arguments they need would go a long way to making the code more easily tested, so investigate the feasibility of this.