Add regression test coverage for contrib/pg_buffercache.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: be39d88934331c47c43d8c51500305e928f06240
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2022-07-30T19:33:44Z
Releases: 16.0
Add regression test coverage for contrib/pg_buffercache.

We can't check the output of this view very closely without
creating portability headaches, but we can make sure that
the number of rows is as-expected.  In any case, this is
sufficient to exercise all the C code within, which is a
lot better than the 0% coverage we had before.

DongWook Lee

Discussion: https://postgr.es/m/CAAcByaLCHGJB7qAENEcx9D09UL=w4ma+yijwF_-1MSqQZ9wK6Q@mail.gmail.com

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