We still have running and no longer used vms (and maybe services). Let's investigate
what really needs to run and stop what's not needed (and stop then destroy those):
```
|------------------+---------+------------+-------------------------------------------------------------------------|
| node | status | new status | note |
|------------------+---------+------------+-------------------------------------------------------------------------|
| cassandra[01-06] | stopped | | no longer required |
| mirror-test | running | stopped | no longer required [in terraform manifest] |
| dbreplica0 | running | stopped | softwareheritage db replication in azure (unused) |
| dbreplica1 | running | | softwareheritage-indexer db replication in azure (sole indexer db copy) |
| storage01 | running | | required but some services can be stopped |
| storage02 | stopped | | no longer required |
|------------------+---------+------------+-------------------------------------------------------------------------|
```