Admin API: add missing /v1/cloud_storage/ endpoints #217

Job	Run time
determine-doc-ids	4s
Check diff (cloud-dataplane)	24s
Check diff (schema-registry)	21s
Check diff (http-proxy)	13s
Check diff (cloud-controlplane)	38s
Check diff (admin)	26s
Deploy API documentation on Bump.sh	0s
	2m 6s

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