postgres_fdw: Revert unstable tests for postgres_fdw.application_name.

Fujii Masao <fujii@postgresql.org>

Commit: 5e64ad369771b66bb3e916aade735defce6e65a1
Author: Fujii Masao <fujii@postgresql.org>
Date: 2021-12-24T08:39:59Z
Releases: 15.0
postgres_fdw: Revert unstable tests for postgres_fdw.application_name.

Commit 6e0cb3dec1 added the tests that check that escape sequences in
postgres_fdw.application_name setting are replaced with status information
expectedly. But they were unstable and caused some buildfarm
members to report the failure. This commit reverts those unstable tests.

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