[MM-45990] log JSON parsing errors in API4 (#20724)

api4/cloud.go

@@ -58,7 +58,7 @@ func handleNotifyAdminToUpgrade(c *Context, w http.ResponseWriter, r *http.Reque
 	var notifyAdminRequest *model.NotifyAdminToUpgradeRequest
 	err := json.NewDecoder(r.Body).Decode(&notifyAdminRequest)
 	if err != nil {
-		c.SetInvalidParam("notifyAdminRequest")
+		c.SetInvalidParamWithErr("notifyAdminRequest", err)
 		return
 	}