fix: use ACCESS_SERVICE_URL in integration tests

[travis]

rather than hardcoding https://staging.up.web3.storage. also add an error message to detect cases where the local ACCESS_SERVICE_URL doesn't match the deployed value

[seed-deploy]

View stack outputs

• pr226-w3infra-CarparkStack

  Name	Value
  BucketName	carpark-pr226-0
  Region	us-east-2

• pr226-w3infra-RoundaboutStack

  Name	Value
  ApiEndpoint	https://75g2n0kma4.execute-api.us-east-2.amazonaws.com
  CustomDomain	https://pr226.roundabout.web3.storage

• pr226-w3infra-SatnavStack

  Name	Value
  BucketName	satnav-pr226-0
  Region	us-east-2

• pr226-w3infra-UploadApiStack

  Name	Value
  ApiEndpoint	https://9rg07w4brg.execute-api.us-east-2.amazonaws.com
  CustomDomain	https://pr226.up.web3.storage

• pr226-w3infra-BusStack

• pr226-w3infra-ReplicatorStack

• pr226-w3infra-UcanInvocationStack

• pr226-w3infra-UploadDbStack