Astarte Pairing API (swagger) contains incorrect examples

[sorru94]

Some of the examples in the Astarte pairing API swagger contain incorrect payloads.

/{realm_name}/devices/{hw_id}/protocols/astarte_mqtt_v1/credentials

Response example is:

{
  "data": {
    "client_certificate": "..."
  }
}

While it should be:

{
  "data": {
    "client_crt": "..."
  }
}

/{realm_name}/devices/{hw_id}/protocols/astarte_mqtt_v1/credentials/verify

Request body example is:

{
  "data": {
    "client_certificate": "..."
  }
}

While it should be:

{
  "data": {
    "client_crt": "..."
  }
}

Response example is only showing the invalid case:

{
  "data": {
    "valid": false,
    "cause": "INVALID_ISSUER"
  }
}

While it should also show the valid case:

{
  "data": {
    "valid": true,
    "until": "2025-03-25 19:25:00.000Z"
  }
}

[Annopaolo]

Closed by #908.