On second thought, remove regex.linux.utf8 regression test altogether.

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

Commit: 987db509ed35ad287c50a7eac381535830f03a29
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2022-01-05T23:18:44Z
Releases: 15.0
On second thought, remove regex.linux.utf8 regression test altogether.

The code-coverage report says that this test doesn't increase
coverage by one single line, which I now realize is because
I made src/test/modules/test_regex/sql/test_regex_utf8.sql
to cover all the code that this would.  So really it's pointless
and we should just drop it.

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