fix(processor): Remove form data envelope items #17014

Job	Run time
Lint Rust Default Features	4m 27s
Lint	6m 30s
Test All Features (ubuntu-latest)	6m 30s
Test (macos-latest)	2m 56s
Test (windows-latest)	5m 48s
Setup build metadata	1s
Integration Tests	11m 40s
Test Python	48s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	6m 30s
Build Docker Image (relay)	33s
Sentry-Relay Integration Tests	6m 2s
Publish Relay to DockerHub	0s
Publish Relay to GCR	0s
Upload build artifacts to gocd	0s
self-hosted-end-to-end	6m 3s
	57m 48s

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