Enable testifylint rules (#34075)

enable testifylint rules disabled in:
https://github.com/go-gitea/gitea/pull/34054

services/webhook/packagist_test.go

@@ -210,5 +210,5 @@ func TestPackagistEmptyPayload(t *testing.T) {
 	var body PackagistPayload
 	err = json.NewDecoder(req.Body).Decode(&body)
 	assert.NoError(t, err)
-	assert.Equal(t, "", body.PackagistRepository.URL)
+	assert.Empty(t, body.PackagistRepository.URL)
 }