tests: Rename conflicting role names

Andres Freund <andres@anarazel.de>

Commit: 6a20b04f0408fb61da610543d4608a08f86d1aeb
Author: Andres Freund <andres@anarazel.de>
Date: 2022-10-05T17:43:13Z
Releases: 16.0
tests: Rename conflicting role names

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

Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/20221003234111.4ob7yph6r4g4ywhu@awork3.anarazel.de

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