refactor: remove unused onReload and onStop from Modal component

- Removed onReload and onStop from propTypes and conditional rendering logic.
- Removed unused reloadIcon and stopIcon imports.
- Kept loading state and progressBar functionality as they are still used.

Co-Authored-By: Gemini <noreply@google.com>

Author: takaokouji

src/components/modal/modal.jsx

@@ -1,5 +1,6 @@
 import classNames from 'classnames';
 import PropTypes from 'prop-types';
+import React from 'react';
 import ReactModal from 'react-modal';
 import {FormattedMessage} from 'react-intl';