fix(kafka): Flush on shutdown #15327

Job	Run time
Lint	3m 5s
Lint	3m 5s
Lint Rust Default Features	1m 31s
Lint Rust Default Features	1m 31s
Setup build metadata	1s
Setup build metadata	1s
Test (macos-latest)	2m 38s
Test (macos-latest)	2m 38s
Test (windows-latest)	5m 22s
Test (windows-latest)	5m 22s
Test All Features (ubuntu-latest)	3m 30s
Test All Features (ubuntu-latest)	3m 30s
Integration Tests	12m 3s
Integration Tests	12m 3s
Test Python	1m 13s
Test Python	1m 13s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	8m 40s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	8m 40s
Build Docker Image (relay)	5m 1s
Build Docker Image (relay)	26s
Publish Relay to DockerHub	0s
Publish Relay to DockerHub	0s
Sentry-Relay Integration Tests	0s
Sentry-Relay Integration Tests	12m 6s
Publish Relay to GCR	0s
Publish Relay to GCR	0s
Upload build artifacts to gocd	0s
Upload build artifacts to gocd	0s
self-hosted-end-to-end	0s
self-hosted-end-to-end	13m 41s
	1h 47m 20s

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