Improve auth error messages

[jeff-cohere]

From Ken Chu:

I tried

curl --request GET \
  --url https://lb-dts.staging.kbase.us/api/v1/databases/jdp \
  --header 'Accept: application/json, application/problem+json' \
  --header 'authorization: 7ISG------------'

where ---- is hidden. I get this error:

{"$schema":"https://lb-dts.staging.kbase.us/schemas/ErrorModel.json","title":"Internal Server Error","status":500,"detail":"Invalid authorization header"}

...

A little closer, now a 401 error.

curl --request GET   --url https://lb-dts.staging.kbase.us/api/v1/databases/jdp   --header 'Accept: application/json, application/problem+json'   --header 'Authorization: Bearer 7ISG---'
{"$schema":"https://lb-dts.staging.kbase.us/schemas/ErrorModel.json","title":"Unauthorized","status":401,"detail":"Get \"[https://kbase.us/services/auth/api/V2/me\](https://kbase.us/services/auth/api/V2/me/)": net/http: invalid header field value for \"Authorization\""}