enforce nolint scope (#34851)

enable nolintlint scope requirement
add comments to new directives so it's more obvious why they are in
place

---

I can also toggle the mandatory comments on if that's something of
interest.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

modules/templates/util_json.go

@@ -9,11 +9,11 @@ import (
 	"code.gitea.io/gitea/modules/json"
 )
 
-type JsonUtils struct{} //nolint:revive
+type JsonUtils struct{} //nolint:revive // variable naming triggers on Json, wants JSON
 
 var jsonUtils = JsonUtils{}
 
-func NewJsonUtils() *JsonUtils { //nolint:revive
+func NewJsonUtils() *JsonUtils { //nolint:revive // variable naming triggers on Json, wants JSON
 	return &jsonUtils
 }