Backup service was unable to get services-to-services token for unauthenticated endpoints (latest backup), due to:
User: arn:aws:sts::************:assumed-role/backup-service-role/************ is not authorized to perform: secretsmanager:GetSecretValue on resource: servicesToken because no identity-based policy allows the secretsmanager:GetSecretValue action
Added proper IAM policy that allows reading the secret by services.
Depends on D12504