Initial implementation

backend/src/templates/historicalSecretLeakIncident.handlebars

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+<!DOCTYPE html>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <meta http-equiv="x-ua-compatible" content="ie=edge">
+  <title>Incident alert: secrets potentially leaked</title>
+</head>
+
+<body>
+  <h3>Infisical has uncovered {{numberOfSecrets}} secret(s) from historical commits to your repo</h3>
+  <p><a href="https://app.infisical.com/secret-scanning"><strong>View leaked secrets</strong></a></p>
+
+  <p>If these are production secrets, please rotate them immediately.</p>
+
+  <p>Once you have taken action, be sure to update the status of the risk in your <a
+      href="https://app.infisical.com/">Infisical
+      dashboard</a>.</p>
+</body>
+
+</html>