fix(spans): Fix name of cache.hit and cache.key field #16929

Job	Run time
Lint Rust Default Features	1m 32s
Test (macos-latest)	2m 21s
Test (windows-latest)	6m 9s
Lint	3m 26s
Setup build metadata	1s
Test All Features (ubuntu-latest)	3m 17s
Integration Tests	8m 51s
Test Python	58s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	7m 11s
Build Docker Image (relay)	28s
Sentry-Relay Integration Tests	12m 27s
self-hosted-end-to-end	13m 33s
Publish Relay to GCR	0s
Publish Relay to DockerHub	0s
Upload build artifacts to gocd	0s
	1h 0m 14s

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