Add tests to ensure commands complete successfully on dropped collections

In SERVER-60533 tests were added to make sure the distinct command correctly executes without error when executing in a sharded context on a collection that has just been dropped. We should make sure we have such tests for at least the aggregate and find commands, e.g. when running on a sharded cluster, we should add tests to make sure the following executes without error.

db.coll.drop()
db.coll.findOne()