Suppress DETAIL output from an event_trigger test.

Suppress 3 lines of unstable DETAIL output from a DROP ROLE statement in
event_trigger.sql.  This is further cleanup for commit dd299df8.

Note that the event_trigger test instability issue is very similar to
the recently suppressed foreign_data test instability issue.  Both
issues involve DETAIL output for a DROP ROLE statement that needed to be
changed as part of dd299df8.

Per buildfarm member macaque.

src/test/regress/expected/event_trigger.out

@@ -185,11 +185,11 @@ alter event trigger regress_event_trigger rename to regress_event_trigger3;
 drop event trigger regress_event_trigger;
 ERROR:  event trigger "regress_event_trigger" does not exist
 -- should fail, regress_evt_user owns some objects
+-- use terse mode to avoid ordering issues in DROP ROLE detail output
+\set VERBOSITY terse
 drop role regress_evt_user;
 ERROR:  role "regress_evt_user" cannot be dropped because some objects depend on it
-DETAIL:  owner of user mapping for regress_evt_user on server useless_server
-owner of default privileges on new relations belonging to role regress_evt_user
-owner of event trigger regress_event_trigger3
+\set VERBOSITY default
 -- cleanup before next test
 -- these are all OK; the second one should emit a NOTICE
 drop event trigger if exists regress_event_trigger2;

src/test/regress/sql/event_trigger.sql

@@ -157,7 +157,10 @@ alter event trigger regress_event_trigger rename to regress_event_trigger3;
 drop event trigger regress_event_trigger;
 
 -- should fail, regress_evt_user owns some objects
+-- use terse mode to avoid ordering issues in DROP ROLE detail output
+\set VERBOSITY terse
 drop role regress_evt_user;
+\set VERBOSITY default
 
 -- cleanup before next test
 -- these are all OK; the second one should emit a NOTICE