enhancement: forc index status formatting update

[lostman]

Description

I think the current output of forc index status, which includes a pretty-printed JSON response, looks slightly off:

✅ Sucessfully fetched service health:

{
  "client_status": "OK",
  "database_status": "OK",
  "uptime": "246"
}
─ fuellabs
   └─ explorer
      • id: 1
      • created_at: 2023-09-19 16:32:05.413191 UTC
      • pubkey: None

This PR makes a small change:

✅ Successfully fetched service health:

client status: OK
database status: OK
uptime: 24m 10s

indexers:
─ fuellabs
   └─ explorer
      • id: 2
      • created at: 2023-09-19 17:21:51.887567 UTC
      • pubkey: None

Testing steps

CI should pass.

Changelog

• Change the formatting of forc-index status.