[GA Provider Page] - Connect provider detail UI to backend APIs

[silent-cipher]

• Replace mock data in approval status widget
  • use existing api - /api/v1/providers/metrics/{spAddress}/window
• Replace mock data in metrics table
  • use existing api - /api/v1/providers/metrics/{spAddress}/window
• Replace mock data in failure analysis table
  • use api ( or raw aggregations ) from [GA Provider Page] - Add backend support for provider-scoped failure analysis #220
• Handle loading, empty, and error states consistently