Network Watcher flow logs are retained 90 days or more

# Enable NSG flow logs with retention >= 90 days
resource "azurerm_network_watcher_flow_log" "<example_resource_name>" {
  name                 = "<example_resource_name>"
  network_watcher_name = "<example_resource_name>"
  resource_group_name  = "<example_resource_name>"
  target_resource_id   = "<example_resource_id>"
  storage_account_id   = "<example_resource_id>"

  enabled = true  # critical: turns on flow logs

  retention_policy {
    enabled = true # critical: activates retention policy
    days    = 90   # critical: 0 (unlimited) or >= 90 to pass
  }
}

// Enable NSG flow logs with retention >= 90 days
resource flowlog 'Microsoft.Network/networkWatchers/flowLogs@2023-09-01' = {
  name: '<example_resource_name>/<example_resource_name>'
  location: '<LOCATION>'
  properties: {
    targetResourceId: '<example_resource_id>'
    storageId: '<example_resource_id>'
    enabled: true           // critical: turns on flow logs
    retentionPolicy: {
      enabled: true         // critical: activates retention policy
      days: 90              // critical: 0 (unlimited) or >= 90 to pass
    }
  }
}