parallel-workload: Go back to INFO-level logging (#35294)

Test run: https://buildkite.com/materialize/nightly/builds/15419

Following #33760

Author: def-

misc/python/materialize/parallel_workload/settings.py

@@ -40,8 +40,6 @@ def _missing_(cls, value):
 ADDITIONAL_SYSTEM_PARAMETER_DEFAULTS = {
     # Uses a lot of memory, hard to predict how much
     "memory_limiter_interval": "0",
-    # TODO: Remove when https://github.com/MaterializeInc/database-issues/issues/9660 is fixed
-    "log_filter": "warn",
     # TODO: Remove when https://github.com/MaterializeInc/database-issues/issues/9656 is fixed
     "persist_stats_filter_enabled": "false",
     # See https://materializeinc.slack.com/archives/CTESPM7FU/p1758195280629909, should reenable when it performs better