Fix incorrectly named error handler in InsertAsyncWithExistingItemAgainstStringIdTable test
Refactor for clarity and correctness.  Only one exit point for test promises.

-Identify enabled runtime features for functional tests
-UpdateAsyncWithWithMergeConflict
-DeleteAsyncWithNosuchItemAgainstStringIdTable
-FilterReadAsyncWithEmptyStringIdAgainstStringIdTable