Add a test for excluding by pk with ordering and offset
This test passes, but it didn't before some recent changes, so it seems good to have a test to make sure we don't regress it (especially if/when Firestore support is merged back to master).
This test passes, but it didn't before some recent changes, so it seems good to have a test to make sure we don't regress it (especially if/when Firestore support is merged back to master).