Admin API: add missing /v1/cloud_storage/ endpoints #239

Job	Run time
determine-doc-ids	4s
Check diff (admin)	27s
Check diff (http-proxy)	11s
Check diff (cloud-dataplane)	25s
Check diff (schema-registry)	12s
Check diff (cloud-controlplane)	31s
Deploy API documentation on Bump.sh	0s
	1m 50s

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