Feat: Fixed the problem of not finding EmailForm #3837 (#3847)

### What problem does this PR solve?

Feat: Fixed the problem of not finding EmailForm #3837

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/flow/flow-drawer/index.tsx

@@ -39,6 +39,7 @@ import OperatorIcon from '../operator-icon';
 
 import { CloseOutlined } from '@ant-design/icons';
 import { lowerFirst } from 'lodash';
+import EmailForm from '../form/email-form';
 import TemplateForm from '../form/template-form';
 import { getDrawerWidth } from '../utils';
 import styles from './index.less';