[metricbeat][Kafka] Improve error logging

There is at least one place i the module where error itself isn't logged which makes it difficult to troubleshoot - https://github.com/elastic/beats/blob/ff9d3fa7c5bd121e60b7279a05dec4130bd54c78/metricbeat/module/kafka/consumergroup/query.go#L120

Update the log statement to include error itself. Check for any other places in the code where log statement might be lacking error.

Start in metricbeat/module/kafka/consumergroup/query.go around line 120 and inspect the referenced log statement. Then search the Kafka module for other log statements that omit an error; done means the relevant errors are included in logging wherever the issue identifies missing context.

Written by the indexing model from the issue text.