Add a regression test for contrib/pg_prewarm.

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

Commit: 2865b4060a434855f90fda41f1b8f4bca7c55b0e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2022-08-01T21:59:44Z
Releases: 16.0
Add a regression test for contrib/pg_prewarm.

We had a little bit of coverage here thanks to e2f65f425,
but not enough; notably, autoprewarm wasn't exercised at all.

Dong Wook Lee, with help from Julien Rouhaud and myself

Discussion: https://postgr.es/m/20220629053812.mifmdrch5iuasg2s@home-desktop

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