Log response status and body in when authentication fails

[reinkrul]

Otherwise, it's hard to find out what failed client side, without looking into the server logs:

failed to create CarePlan: FHIR request failed (POST https://proxy/clinic/orca/cps/CarePlan): Post "https://proxy/clinic/orca/cps/CarePlan": OAuth2 token request (resource=https://proxy/clinic/orca/cps/CarePlan): failed service access token response: 500 Internal Server Error

Server logs:

time="2024-07-28T04:46:19Z" level=error msg="RequestServiceAccessToken failed" error="failed to retrieve presentation definition: server returned HTTP 404 (expected: 200)" module=Auth/iam operation=RequestServiceAccessToken operationID=RequestServiceAccessToken requestURI="/internal/auth/v2/did:web:proxy:nuts:iam:708fa077-9600-405b-b289-f7bf99568120/request-service-access-token" user="<nil>"