Set FirstLevel true for auto-created third parties

Third parties created by the tracker mapping worker are confirmed
active on the organization's cookie banner, making them first-level
by definition. Also remove unused ptr test helpers.

Signed-off-by: Émile Ré <emile@probo.com>

pkg/thirdparty/match_test.go

@@ -23,9 +23,6 @@ import (
 	"go.probo.inc/probo/pkg/gid"
 )
 
-//go:fix inline
-func ptr[T any](v T) *T { return new(v) }
-
 func TestStripCorporateSuffixes(t *testing.T) {
 	t.Parallel()