As a mongoDB engineer,
I should be able to run the selected_tests_gen task,
and know that it will run all tasks for a given set of test mappings returned by selected-tests service,
So that I know all tasks that are affected by my code changes will be run

AC:

• When I run the selected_tests_gen task in my patch build, it runs all tasks related to my file changes (using the test mappings model)
• When I run buildscripts/selected_tests.py locally, it logs which tasks and steps are executed so that other engineers can debug any issues encountered.