The Python test hooks introduced in WT-7329 should let us run our current Python functional tests on tiered tables without manually editing each test or creating new tests.

This ticket will test this out by trying to get the existing cursor tests (i.e., test_cursor*.py) to run with tiered cursors.  

For this ticket, it will be sufficient to create tiered tables/cursors that just layer two row-stores on top of each other.  I.e., we don't need to use log-structured/object storage.  

If this ticket identifies pieces that are missing or broken in the current implementation we'll create new tickets to address those problems.