Add "organization_copilot_metrics" installation permission

I am validating the Installation App token and I am not getting the "organization_copilot_metrics" permisions included in the JSON.
JSON Output from the API:

```
{
 "expires_at": "2026-01-26T14:09:46Z",
 "permissions":
 {
 ...
 "organization_copilot_metrics": "read",
 "organization_copilot_seat_management": "read",
 ...
 },
 "repository_selection": "all",
 "token": "ghs_redacted"
}