ref(metrics): Remodel metric submission flow #14680

Job	Run time
Lint	1m 28s
Lint Rust Default Features	56s
Test (macos-latest)	1m 3s
Test (windows-latest)	3m 46s
Test All Features (ubuntu-latest)	59s
Setup build metadata	1s
Test Python	39s
Integration Tests	1m 27s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	2m 35s
Build Docker Image	0s
Publish Relay to DockerHub	0s
Upload build artifacts to gocd	0s
Publish Relay to GCR	0s
Sentry-Relay Integration Tests	0s
self-hosted-end-to-end	0s
	12m 54s

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