Kafka Scaler: Improve error logging for GetBlock() method

[dttung2905]

Proposal

Currently, in case of error getting partition block, the error is hidden as GetBlock() method from sarama does not return the specific error (link)

	block := offsets.GetBlock(topic, partitionID)
	if block == nil {
		errMsg := fmt.Errorf("error finding offset block for topic %s and partition %d", topic, partitionID)
		s.logger.Error(errMsg, "")
		return 0, 0, errMsg
	}

This makes it very hard to debug the real reason as highlighted in #4215. We can print out the offsets.Blocks for more information

Use-Case

No response

Is this a feature you are interested in implementing yourself?

Yes

Anything else?

No response