SERVER-117247 introduced unit testing for state_utils.cpp, but was focused on test coverage around createOplogEntryForStepUp (which was created as part of the logServerManager refactor). We're currently lacking unit test coverage for the finalizeStepUp code path of the conditional append log succeeding but no checkpoint.

Acceptance criteria for this ticket would be adding this test case for standbyAppendLog succeeding but getLastCompletedCheckpointInfo returning an empty checkpoint. 

Impact: Making our step up and state machine unit test coverage more robust.