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>

models/asymkey/ssh_key_parse.go

@@ -208,7 +208,7 @@ func SSHNativeParsePublicKey(keyLine string) (string, int, error) {
 
 	// The ssh library can parse the key, so next we find out what key exactly we have.
 	switch pkey.Type() {
-	case ssh.KeyAlgoDSA: //nolint
+	case ssh.KeyAlgoDSA: //nolint:staticcheck // it's deprecated
 		rawPub := struct {
 			Name       string
 			P, Q, G, Y *big.Int