feat(severity): adds log for severity (#55945)

Adds logs for debugging

src/sentry/event_manager.py

@@ -2041,6 +2041,11 @@ def _get_severity_score(event: Event) -> float | None:
     if error_type:
         message = error_type if not error_msg else f"{error_type}: {error_msg}"
 
+    logger.info(
+        "event_manager.get_severity_score",
+        extra={"event_message": message, "event_id": event.event_id},
+    )
+
     if message:
         with metrics.timer("event_manager._get_severity_score"):
             with sentry_sdk.start_span(op="event_manager._get_severity_score"):