Also add sta handling for request.

Author: kporras07

src/Request/Request.php

@@ -451,10 +451,15 @@ public function request($path, array $options = []): RequestOperationResult
         }
 
         if ($response->getStatusCode() == 409 && $body == self::EVCS_SITE_RESPONSE) {
-            // This request is expected to fail for an eVCS site, throw exception that will be catched down the road.
+            // This request is expected to fail for an eVCS site, throw exception.
             throw new TerminusEvcsSiteException(self::EVCS_SITE_EXCEPTION_MESSAGE);
         }
 
+        if ($response->getStatusCode() == 409 && $body == self::STA_SITE_RESPONSE) {
+            // This request is expected to fail for an STA site, throw exception.
+            throw new TerminusEvcsSiteException(self::STA_SITE_EXCEPTION_MESSAGE);
+        }
+
         return new RequestOperationResult([
             'data' => $decoded_body ?? $body,
             'headers' => $headers,