feat(flags): Add flags context #17178

Job	Run time
detect what files changed	4s
Lint	3m 13s
Lint Rust Default Features	1m 17s
Test (macos-latest)	2m 26s
Test All Features (ubuntu-latest)	3m 16s
Test (windows-latest)	5m 10s
Test Python	51s
Setup build metadata	1s
Integration Tests	8m 14s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	7m 4s
validate-devservices-config	0s
Build Docker Image (relay)	30s
Sentry-Relay Integration Tests	11m 0s
Publish Relay to DockerHub	0s
self-hosted-end-to-end	8m 58s
Publish Relay to GCR	0s
Upload build artifacts to gocd	0s
	52m 4s

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