Swagger info corrections (#9441)

* use numbers and not http.Status___ enum

* fix test

* add many missing swagger responses

* code format

* Deletion Sould return 204 ...

* error handling improvements

* if special error type ... then add it to swagger too

* one smal nit

* invalidTopicsError is []string

* valid swagger specification 2.0
 - if you add responses swagger can tell you if you do it right 👍

* use ctx.InternalServerError

* Revert "use numbers and not http.Status___ enum"

This reverts commit b1ff386e24.

* use http.Status* enum everywhere

modules/context/api.go

@@ -39,6 +39,13 @@ type APIValidationError struct {
 	URL     string `json:"url"`
 }
 
+// APIInvalidTopicsError is error format response to invalid topics
+// swagger:response invalidTopicsError
+type APIInvalidTopicsError struct {
+	Topics  []string `json:"invalidTopics"`
+	Message string   `json:"message"`
+}
+
 //APIEmpty is an empty response
 // swagger:response empty
 type APIEmpty struct{}