chore(docs): Add doc for Hubble control plane and metrics #4005

Job	Run time
Build Operator Images (linux, amd64)	3m 5s
Build Agent Images (linux, amd64)	3m 47s
Build Agent Images (linux, arm64)	5m 29s
Build Agent Windows Images (windows, amd64, 2019)	3m 29s
Build Agent Windows Images (windows, amd64, 2022)	3m 3s
Build Kubectl Retina Images (linux, amd64)	1m 39s
Build Kubectl Retina Images (linux, arm64)	1m 48s
Build Retina Shell Images (linux, amd64)	38s
Build Retina Shell Images (linux, arm64)	1m 34s
Generate Manifests	0s
Retina Performance Test	0s
Run E2E Tests	0s
	24m 32s

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