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 b1ff386e2418ed6a7f183e756b13277d701278ef.

* use http.Status* enum everywhere

routers/api/v1/admin/repo.go

@@ -35,8 +35,13 @@ func CreateRepo(ctx *context.APIContext, form api.CreateRepoOption) {
 	//     "$ref": "#/responses/Repository"
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
+	//   "404":
+	//     "$ref": "#/responses/notFound"
+	//   "409":
+	//     "$ref": "#/responses/error"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	owner := user.GetUserByParams(ctx)
 	if ctx.Written() {
 		return