ErrorInfo from Kingdom public API malformed

[SanjayVas]

The ErrorInfo is missing the domain and code fields. It also appears to include resource IDs in the metadata instead of resource names. For example:

Expected

domain: "halo.wfanet.org"
code: "REQUISITION_STATE_ILLEGAL"
metadata {
  key: "requisition"
  value: "dataProviders/foo/requisitions/AAAAAAAAAHs"
}
metadata {
  key: "state"
  value: "FULFILLED"
}

Actual

metadata {
  key: "requisitionId"
  value: "AAAAAAAAAHs"
}
metadata {
  key: "state"
  value: "FULFILLED"
}

See AIP-193.