Adjust recently added test for pg_signal_autovacuum role

Andrew Dunstan <andrew@dunslane.net>

Commit: 49546ae9c74f02dc2a0d6b5469ba0bb025ae25c2
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2024-07-16T14:05:48Z
Releases: 18.0
Adjust recently added test for pg_signal_autovacuum role

This test was added by commit d2b74882ca, but fails if
log_error_verbosity is set to verbose. Adjust the regex that checks the
error message to allow for it containing an SQL status code.

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