Add testing tasks

[mds1]

We should add a directory calling something like tasks/test that contains at least 2 tasks that are always executable, e.g. one config change task and one upgrade task. These tasks should be full tasks complete with postCheck assertions and validations, and these tasks should always run in CI. They will serve as tests to make sure changes to this repo do not break things. These tasks should exercise a range of addresses, contracts, and features to ensure sufficient coverage of repository functionality