Improve problem details responses AB#16846

[MikeLyttle]

Implements AB#16846

Description

• configures back-end to return problem details responses instead of empty HTTP 401, 403, or other error responses
• improves alignment of our custom problem details responses with the properties as defined in the RFC, using a URI for "type" and removing "instance"
• replaces manual ProblemDetails creation with usage of built-in ProblemDetailsFactory
• updates Swagger documentation to clarify HTTP 500-level response types return an object of type ProblemDetails (since only HTTP-400 level response types do this automatically)

Testing

• Unit Tests Updated
• Functional Tests Updated
• Not Required

Items to Review:

• General PR Guidelines