[server] fix exception logging

Author: Cyril de Catheu

thirdeye-server/src/main/java/ai/startree/thirdeye/exception/GenericExceptionMapper.java

@@ -47,7 +47,7 @@ public Response toResponse(final Throwable exception) {
     LOG.debug(
         "Request failed because of a {}. Returning error code {}",
         exception.getClass().getSimpleName(),
-        status.getRecommendedStatusCode());
+        status.getRecommendedStatusCode(), exception);
     final StatusApi statusApi = new StatusApi()
         .setCode(status)
         .setMsg(exception.getMessage())