Destroy sharding task executors and AsyncRequestSenders after the PeriodicRunner is destroyed in mongod shutdown

Problem Description

Some tasks created to use the PeriodicRunner make use of sharding task executors and AsyncRequestSenders, such as the LogicalSessionCache refresh or reap threads.

In shutdown on mongod, we destroy the Grid's task executors before we destroy the PeriodicRunner. This can lead to both attempted use of destroyed data, and shutdown exceptions when trying to call member functions on the task executors and AsyncRequestSenders.

Proposed Fix

The simple fix is to shut down the PeriodicRunner before shutting down Sharding-related machinery. We will place the call to shut down the PeriodicRunner here.

This fix has been verified to fix errors in an Evergreen patch.