ReplSetTest and ShardingTest used to be built-ins of the test runner but are no longer, and are in fact now ES modules. Since the test runner doesn't support a top-level import (dynamic or not) in interactive mode, we don't have an easy way to use these types in those types of workflows. This ticket will cover reintroducing support for these types in interactive sessions, while preserving the requirement to list the imports in jstests.