Bug 1974441

This is ONLY needed when the OCS cluster consumes an external object store too.

Similarly to https://access.redhat.com/documentation/en-us/red_hat_openshift_container_storage/4.6/html-
single/updating_openshift_container_storage/index#enabling-monitoring-for-the-object-service-dashboard_rhocs

we must document the upgrade from 4.7 to 4.8 for external mode when an object store is used.
The script "ceph-external-cluster-details-exporter.py" must run again, with the same identical arguments used the first time.

The output will contain the newly created rgw admin ops user that rook will use to call out the rgw admin ops API.

Then, the JSON output will be used to update the Secret rook-ceph-external-cluster-details. For this we will use the UI.

Example output of the new JSON:

[{"name": "rook-ceph-mon-endpoints", "kind": "ConfigMap", "data": {"data": "a=10.100.223.211:6789", "maxMonId": "0", "mapping": "{}"}}, {"name": "rook-ceph-mon", "kind": "Secret", "data": {"admin-secret": "admin-secret", "fsid": "5cd5684c-8b8b-4d59-a98a-525f63ae69a3", "mon-secret": "mon-secret"}}, {"name": "rook-ceph-operator-creds", "kind": "Secret", "data": {"userID": "client.healthchecker", "userKey": "AQCzxdBg5bB5LhAANBqGVmWn+4dsPESBCWkcLw=="}}, {"name": "rook-csi-rbd-node", "kind": "Secret", "data": {"userID": "csi-rbd-node", "userKey": "AQAe0bhgVvahJxAAGJLuP/Tajh2fz6ExqxYT/A=="}}, {"name": "ceph-rbd", "kind": "StorageClass", "data": {"pool": "device_health_metrics"}}, {"name": "monitoring-endpoint", "kind": "CephCluster", "data": {"MonitoringEndpoint": "172.17.0.11", "MonitoringPort": "9283"}}, {"name": "rook-csi-rbd-provisioner", "kind": "Secret", "data": {"userID": "csi-rbd-provisioner", "userKey": "AQAe0bhgkpHWGhAAJNPrBBD5OfbQvGRAYUrbCg=="}}, {"name": "ceph-rgw", "kind": "StorageClass", "data": {"endpoint": "10.108.182.47:80", "poolPrefix": "my-store"}}, {"name": "rgw-admin-ops-user", "kind": "Secret", "data": {"accessKey": "ESV683AZEPJ13BC5IO9R", "secretKey": "YzL0veXMUBvXGPCKmpA83ud7Vm57zB8fxK17Vewz"}}]