Changes to Validate TestRail credentials

added the optional property guardrail/allOf[#/components/schemas/GuardrailRefusal]/approval to the response with the 400 status

added the optional property guardrail/allOf[#/components/schemas/GuardrailRefusal]/approval to the response with the 401 status

added the optional property guardrail/allOf[#/components/schemas/GuardrailRefusal]/approval to the response with the 403 status

added the optional property guardrail/allOf[#/components/schemas/GuardrailRefusal]/approval to the response with the default status

added the optional property error_code to the response with the 400 status

added the optional property error_code to the response with the 401 status

added the optional property error_code to the response with the 403 status

added the optional property error_code to the response with the default status

added the optional property guardrail to the response with the 400 status

added the optional property guardrail to the response with the 401 status

added the optional property guardrail to the response with the 403 status

added the optional property guardrail to the response with the default status

endpoint added