Summary:
Python tests (under test/suite directory) use PALM extension for disagg testing by hardcoding connection settings. E.g.: disaggregated=(page_log=palm, ...

The following files also hardcode palm as the only implementation:

• test/suite/helper_disagg.py
• test/suite/hook_disagg.py
• test/suite/wthooks.py

All these places should make page_log settings configurable.

Definition of done:

• page_log settings are configurable from external files and/or command-line.
• page_log implementation can be selected without changing source files.
• Evergreen task can select page_log implementation.