Make label templates have consistent behavior and priority (#23749) (#24071)

Backport #23749

Fix https://github.com/go-gitea/gitea/issues/23715

Backported manually and tested manually.

routers/web/org/setting.go

@@ -247,6 +247,6 @@ func Labels(ctx *context.Context) {
 	ctx.Data["PageIsOrgSettings"] = true
 	ctx.Data["PageIsOrgSettingsLabels"] = true
 	ctx.Data["RequireTribute"] = true
-	ctx.Data["LabelTemplates"] = repo_module.LabelTemplates
+	ctx.Data["LabelTemplateFiles"] = repo_module.LabelTemplateFiles
 	ctx.HTML(http.StatusOK, tplSettingsLabels)
 }