Return configuration on /v6/config

[David Weber]

Description

Version**: 2.5.5
The endpoints /ccompat/v6 and v7 regarding GET /config should behave correctly when using authorization.
Currently when the setting REGISTRY_AUTH_ANONYMOUS_READ_ACCESS_ENABLED is set to true, one receives a 401 for GET /config which should not be the case.

Steps to Reproduce

1. Enable AUTH_ENABLED=true and ROLE_BASED_AUTHZ_ENABLED=true
2. Enable REGISTRY_AUTH_ANONYMOUS_READ_ACCESS_ENABLED=true
3. Call registry with GET /ccompat/v6/config
4. You get 401

Expected vs Actual Behaviour

Should return something like

{
  "compatibilityLevel": "BACKWARD"
}

[apicurio-bot]

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