Expose user exception thrown during rebalance (#2667)

As a user, I do not want exception my exception be effectively ignored by framework by logging them on debug level

Author: michaldo

spring-kafka/src/main/java/org/springframework/kafka/listener/ConsumerAwareRebalanceListener.java

@@ -52,7 +52,7 @@ default void onPartitionsRevokedBeforeCommit(Consumer<?, ?> consumer, Collection
 			onPartitionsRevoked(partitions);
 		}
 		catch (Exception e) { // NOSONAR
-			LOGGER.debug(e, "User method threw exception");
+			LOGGER.error(e, "User method threw exception");
 		}
 	}
 
@@ -76,7 +76,7 @@ default void onPartitionsLost(Consumer<?, ?> consumer, Collection<TopicPartition
 			onPartitionsLost(partitions);
 		}
 		catch (Exception e) { // NOSONAR
-			LOGGER.debug(e, "User method threw exception");
+			LOGGER.error(e, "User method threw exception");
 		}
 	}
 
@@ -91,7 +91,7 @@ default void onPartitionsAssigned(Consumer<?, ?> consumer, Collection<TopicParti
 			onPartitionsAssigned(partitions);
 		}
 		catch (Exception e) { // NOSONAR
-			LOGGER.debug(e, "User method threw exception");
+			LOGGER.error(e, "User method threw exception");
 		}
 	}