Warning log to verbose in RemovedPartitionState

Hi,

In case of lot of topics and/or partitions [this log](https://github.com/confluentinc/parallel-consumer/blob/8907c804d768059b3a59a9192f7b5847e3fec1b4/parallel-consumer-core/src/main/java/io/confluent/parallelconsumer/state/RemovedPartitionState.java#L68) is becoming huge

```java
log.warn("Dropping polled record batch for partition no longer assigned. WC: {}", recordsAndEpoch);
```
add will be truncated by some log tooling (for Example in Datadog)

I think that the useful information at warn level are the topic name and partition number.

The full state of EpochAndRecordsMap may be logged at the debug level

Regards
Benoit