Move updateref and removeref to gitrepo and remove unnecessary open repository (#35511)

Extracted from #35077
`UpdateRef` and `RemoveRef` will call git commands even for gogit
version.

routers/api/v1/repo/issue.go

@@ -979,7 +979,7 @@ func DeleteIssue(ctx *context.APIContext) {
 		return
 	}
 
-	if err = issue_service.DeleteIssue(ctx, ctx.Doer, ctx.Repo.GitRepo, issue); err != nil {
+	if err = issue_service.DeleteIssue(ctx, ctx.Doer, issue); err != nil {
 		ctx.APIErrorInternal(err)
 		return
 	}