Add tests for logical replication spilled stats.

Amit Kapila <akapila@postgresql.org>

Commit: 8fccf75834c11798e3b13a4cebedfb8ae683857a
Author: Amit Kapila <akapila@postgresql.org>
Date: 2020-10-13T03:00:35Z
Releases: 14.0
Add tests for logical replication spilled stats.

Commit 9868167500 added a mechanism to track statistics corresponding to
the spilling of changes from ReorderBuffer but didn't add any tests.

Author: Amit Kapila and Sawada Masahiko
Discussion: https://postgr.es/m/CA+fd4k5_pPAYRTDrO2PbtTOe0eHQpBvuqmCr8ic39uTNmR49Eg@mail.gmail.com

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