Improve logging and metrics for kafka receiver #30256
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Description:
This adds additional information to the existing logs for consumer group startup and adds the topic and partition to the existing instanceName label so that users of the kafka receiver can monitor all of the metrics per topic/partition.
Currently the metrics are all reported with the same tags so each partition clobbers the other partitions data
Link to tracking Issue:
#28631
Testing:
This patch ran in our collectors for several months.
TODO: Investigate if unit tests could/should be added
Documentation:
The existing telemetry is not documented, let me know if I should add some documentation for it.