pgsql: tests: Rename conflicting role names

tests: Rename conflicting role names

These cause problems when running installcheck-world USE_MODULE_DB=1 with -j.

Note: This patch has been originally applied to v16 and newer branches
as of 6a20b04f0408. Sami Imseih has reported this issue as being
possible to reach for other branches still supported: REL_15_STABLE and
REL_14_STABLE.

Reviewed-by: Michael Paquier <michael(at)paquier(dot)xyz>
Discussion: https://postgr.es/m/20221003234111.4ob7yph6r4g4ywhu@awork3.anarazel.de
Discussion: https://postgr.es/m/CAA5RZ0soPHUvwXLZ+mf5Q=uJRL5ggnRg1uB0qKVG1bbdA9up6w@mail.gmail.com
Backpatch-through: 14

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/aa2ec0403d0af0082a8f8a68a5a231c4e62a9c3a
Author: Andres Freund <andres(at)anarazel(dot)de>

Modified Files
--------------
contrib/adminpack/expected/adminpack.out | 20 ++++++++--------
contrib/adminpack/sql/adminpack.sql | 20 ++++++++--------
contrib/passwordcheck/expected/passwordcheck.out | 16 ++++++-------
contrib/passwordcheck/sql/passwordcheck.sql | 16 ++++++-------
src/pl/plperl/expected/plperl_setup.out | 30 ++++++++++++------------
src/pl/plperl/sql/plperl_setup.sql | 30 ++++++++++++------------
6 files changed, 66 insertions(+), 66 deletions(-)