cookiebanner: rename DetectedTracker.InsertIfNotExists to Upsert

The method uses ON CONFLICT ... DO UPDATE, so the name now
matches the actual behaviour. TrackerPattern.InsertIfNotExists
keeps its name because it uses ON CONFLICT ... DO NOTHING.

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

pkg/cookiebanner/service.go

@@ -2179,8 +2179,8 @@ func (s *Service) reportDetectedTracker(
 		UpdatedAt:        now,
 	}
 
-	if _, err := tracker.InsertIfNotExists(ctx, tx, scope); err != nil {
-		return fmt.Errorf("cannot insert detected tracker: %w", err)
+	if _, err := tracker.Upsert(ctx, tx, scope); err != nil {
+		return fmt.Errorf("cannot upsert detected tracker: %w", err)
 	}
 
 	return nil