Add Slack customer registration notification functionality

services/nginx/app/routes/authRoute.php

@@ -7,6 +7,7 @@ use classes\economic;
 use classes\email;
 use classes\release_manager;
 use classes\recaptcha;
+use classes\slack;
 use classes\totp;
 use classes\virkdata;
 use classes\webauthn;
@@ -819,6 +820,15 @@ class authRoute
                 'message' => $exception->getMessage(),
             ]);
         }
+
+        try {
+            (new slack())->send_customer_registration_notification($customerNumber);
+        } catch (Exception $exception) {
+            $this->logRegisterCvrIssue('AUTH_REGISTER_CVR_SLACK_NOTIFICATION_FAILED', [
+                'customerNumber' => $customerNumber,
+                'message' => $exception->getMessage(),
+            ]);
+        }
     }
 
     private function logRegisterCvrIssue(string $action, array $context): void