feat(relay): Add span links to event schema #17247

Job	Run time
Setup build metadata	1s
Lint	2m 42s
detect what files changed	3s
Lint Rust Default Features	2m 22s
Test (macos-latest)	2m 0s
Test All Features (ubuntu-latest)	2m 24s
Integration Tests	8m 9s
Test (windows-latest)	5m 6s
Test Python	1m 1s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	7m 2s
validate-devservices-config	0s
Build Docker Image (relay)	50s
Sentry-Relay Integration Tests	11m 3s
Publish Relay to DockerHub	0s
Upload build artifacts to gocd	0s
Publish Relay to GCR	0s
self-hosted-end-to-end	13m 22s
	56m 5s

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