instr(kafka): Tag producer error metric with topic #11628

Job	Run time
Build Docker Image (amd64, relay)	10m 8s
Lint Rust Default Features	1m 21s
Build Docker Image (amd64, relay-pop)	6m 24s
Lint	3m 3s
Test All Features (ubuntu-latest)	3m 14s
Integration Tests	9m 57s
Test (macos-latest)	5m 49s
Test (windows-latest)	5m 19s
Test Python 3.10	1m 3s
Sentry-Relay Integration Tests	8m 58s
Push GCR Docker Image (relay)	1m 6s
Publish Relay to DockerHub	0s
Push GCR Docker Image (relay-pop)	1m 9s
	57m 31s

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