Refactor emails models objects, rework related tests

common/tests/_support/EmailsRenderer.php

@@ -0,0 +1,14 @@
+<?php
+declare(strict_types=1);
+
+namespace common\tests\_support;
+
+use common\components\EmailsRenderer\Component;
+
+class EmailsRenderer extends Component {
+
+    public function render(string $templateName, string $locale, array $params = []): string {
+        return 'template';
+    }
+
+}