postgres_fdw: Revert unstable tests for postgres_fdw.application_name.

Fujii Masao <fujii@postgresql.org>

Commit: 98dbef90eb29b13079ba3bd260b3c5818904ee86
Author: Fujii Masao <fujii@postgresql.org>
Date: 2021-09-08T07:28:43Z
Releases: 15.0
postgres_fdw: Revert unstable tests for postgres_fdw.application_name.

Commit 449ab63505 added the tests that check that postgres_fdw.application_name
GUC works as expected. But they were unstable and caused some buildfarm
members to report the failure. This commit reverts those unstable tests.

Reported-by: Tom Lane as per buildfarm
Discussion: https://postgr.es/m/3220909.1631054766@sss.pgh.pa.us

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