Duplicate rpc service in swh-cassandra namespace

This is meant to be a mr that we will progressively merge/update once a review validates it. The helm diff/dyff for each commit will be added as a comment in the mr.

services so far:

• objstorage
  • objstorage read-only [1]
  • objstorage ro-saam-zfs [2]
  • objstorage ro-banco-xfs [3]
• storage
  • storage azure-readonly [4] (see !476 (comment 183612))
  • storage winery [5]
• indexer-storage
  • read-only [6]
  • read-write [7]

Refs. swh/infra/sysadm-environment#5399 (closed)