Improve email testing logic and reliability

Author: srenon

view/adminhtml/email/magento_email_test.html

@@ -269,7 +269,6 @@
                                 <div style="font-size: 12px; line-height: 14px; color: #555555; font-family: 'Montserrat', 'Trebuchet MS', 'Lucida Grande', 'Lucida Sans Unicode', 'Lucida Sans', Tahoma, sans-serif;">
                                     <ul>
                                         <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/google-tag-manager.html?utm_source=gtm%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=gtm" target="_blank" rel="noopener">Google Tag Manager</a></span></li>
-                                        <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/enhanced-ecommerce-for-google-tag-manager.html?utm_source=enhanced%20ecommerce%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=eegtm" target="_blank" rel="noopener">Enhanced Ecommerce for Google Tag Manager</a></span></li>
                                         <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/google-analytics-4-for-google-tag-manager.html?utm_source=ga4%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=gtmga4" target="_blank" rel="noopener">Google Analytics 4</a></span></li>
                                         <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/datalayer-for-google-tag-manager.html?utm_source=datalayer%20gtm%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=gtmdl" target="_blank" rel="noopener">Google Tag Manager DataLayer</a></span></li>
                                         <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/reindex.html?utm_source=reindex%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=reindex" target="_blank" rel="noopener">Admin Reindex</a></span></li>

view/adminhtml/email/zend_email_test.html

@@ -268,7 +268,6 @@
                                 <div style="font-size: 12px; line-height: 14px; color: #555555; font-family: 'Montserrat', 'Trebuchet MS', 'Lucida Grande', 'Lucida Sans Unicode', 'Lucida Sans', Tahoma, sans-serif;">
                                     <ul>
                                         <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/google-tag-manager.html?utm_source=gtm%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=gtm" target="_blank" rel="noopener">Google Tag Manager</a></span></li>
-                                        <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/enhanced-ecommerce-for-google-tag-manager.html?utm_source=enhanced%20ecommerce%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=eegtm" target="_blank" rel="noopener">Enhanced Ecommerce for Google Tag Manager</a></span></li>
                                         <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/google-analytics-4-for-google-tag-manager.html?utm_source=ga4%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=gtmga4" target="_blank" rel="noopener">Google Analytics 4</a></span></li>
                                         <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/datalayer-for-google-tag-manager.html?utm_source=datalayer%20gtm%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=gtmdl" target="_blank" rel="noopener">Google Tag Manager DataLayer</a></span></li>
                                         <li style="font-size: 12px; padding: 3px 0; line-height: 14px;"><span style="line-height: 19px; font-size: 16px;"><a style="text-decoration: underline; color: #555555;" href="https://www.magepal.com/magento2/extensions/reindex.html?utm_source=reindex%20promo&amp;utm_medium=email&amp;utm_campaign=top%20extensions&amp;utm_content=reindex" target="_blank" rel="noopener">Admin Reindex</a></span></li>