Remove log level tests

When debug logging is enabled, we log something at each log level
to test if logs are emitted. I don't think this is particularly useful,
but it's certainly annoying, because I constatnly need to filter
out these logs when searching if any errors happened during tests.

Author: mkuratczyk

deps/rabbit/src/rabbit_prelaunch_logging.erl

@@ -1690,34 +1690,3 @@ get_less_severe_level(LevelA, LevelB) ->
         lt -> LevelA;
         _  -> LevelB
     end.
-
--spec maybe_log_test_messages(log_config()) -> ok.
-
-maybe_log_test_messages(
-  #{per_category := #{prelaunch := #{level := debug}}}) ->
-    log_test_messages();
-maybe_log_test_messages(
-  #{global := #{level := debug}}) ->
-    log_test_messages();
-maybe_log_test_messages(_) ->
-    ok.
-
--spec log_test_messages() -> ok.
-
-log_test_messages() ->
-    ?LOG_DEBUG("Logging: testing debug log level",
-               #{domain => ?RMQLOG_DOMAIN_PRELAUNCH}),
-    ?LOG_INFO("Logging: testing info log level",
-              #{domain => ?RMQLOG_DOMAIN_PRELAUNCH}),
-    ?LOG_NOTICE("Logging: testing notice log level",
-                #{domain => ?RMQLOG_DOMAIN_PRELAUNCH}),
-    ?LOG_WARNING("Logging: testing warning log level",
-                 #{domain => ?RMQLOG_DOMAIN_PRELAUNCH}),
-    ?LOG_ERROR("Logging: testing error log level",
-               #{domain => ?RMQLOG_DOMAIN_PRELAUNCH}),
-    ?LOG_CRITICAL("Logging: testing critical log level",
-                  #{domain => ?RMQLOG_DOMAIN_PRELAUNCH}),
-    ?LOG_ALERT("Logging: testing alert log level",
-               #{domain => ?RMQLOG_DOMAIN_PRELAUNCH}),
-    ?LOG_EMERGENCY("Logging: testing emergency log level",
-                   #{domain => ?RMQLOG_DOMAIN_PRELAUNCH}).