Add missing wait_for_catchup() to pg_visibility tap test

Alexander Korotkov <akorotkov@postgresql.org>

Commit: e3ec9dc1bf4983fcedb6f43c71ea12ee26aefc7a
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2024-08-15T21:58:32Z
Releases: 18.0
Add missing wait_for_catchup() to pg_visibility tap test

e2ed7e32271a introduced check of pg_visibility on standby.  This commit adds
missing wait_for_catchup() to synchronize standby before querying it.

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