CLOUDP-70063: mongocli ops-manager admin backup blockstore(s) describe

[andreaangiolillo]

Proposed changes

Jira ticket: CLOUDP-70063

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code

Further comments

./bin/mongocli om admin backup blockstore describe blockstore -P ops
ID           URI                                     SSL     LOAD FACTOR
blockstore   mongodb://test1:test1@localhost:22222   false   1

./bin/mongocli om admin backup blockstore describe blockstore -P ops -o json
{
  "id": "blockstore",
  "uri": "mongodb://test1:test1@localhost:22222",
  "ssl": false,
  "assignmentEnabled": true,
  "encryptedCredentials": false,
  "loadFactor": 1
}

[andreaangiolillo]

waiting for #470

[gssbzn]

small copy change as the admin is global and not per project

[gssbzn]

LGTM one small comment but not blocking

[gssbzn]

maybe we should add the word configuration here, as in, "Manage backup blockstore configuration"

[gssbzn]

LGTM