feat: connector credentials check

templates/emails/errors/connector_credentials.twig

@@ -0,0 +1,22 @@
+{% extends "emails/base.html.twig" %}
+
+{% set email_color = '#f9f9f9' %}
+{% set title = 'Connector Validation Failed' %}
+{% block content %}
+    <p>Hello, <br/>
+        We would like to inform you that an authentication error occurred during the weekly validation of the following connector:<br/>
+        <strong>Connector ID:</strong> {{ connector.token }}<br/>
+        <strong>Connector Provider:</strong> {{ connector.provider }}<br/>
+    </p>
+    <p>This issue indicates that the login credentials provided for the connector could not be validated. As a result, we were unable to verify the connector's validity.</p>
+    <p>Here are some possible causes:</p>
+    <ul>
+        <li>The login credentials for the connector may have been changed or are incorrect.</li>
+        <li>A temporary issue with the authentication server or service may have occurred.</li>
+    </ul>
+    <br/><br/>
+    <p>To resolve this issue, please verify the login credentials associated with the connector and update them if necessary.</p>
+    <p>Thank you for your attention,<br/>
+        Sincerely,<br/>
+    </p>
+{% endblock %}