MBMS-78949 | Self-Service: PMC: Supporting documents: Error message n…

…ot preventing user from continuing to next page (#33070)

* MBMS-78949 found this validateFileField component and added it to veteranSupportDocs. This should be the fix if it passes POR/UI/UX.

* MBMS-78949 wrapped this in a prod flag

src/applications/simple-forms/40-0247/pages/veteranSupportDocs.js

@@ -1,6 +1,7 @@
 import environment from 'platform/utilities/environment';
 
 import { titleUI } from 'platform/forms-system/src/js/web-component-patterns/titlePattern';
+import { validateFileField } from 'platform/forms-system/src/js/validation';
 import { FileField } from '../components/FileField';
 import SupportingDocsViewField from '../components/SupportingDocsViewField';
 
@@ -44,6 +45,7 @@ export default {
         keepInPageOnReview: true,
         classNames: 'schemaform-file-upload',
       },
+      'ui:validations': !environment.isProduction() ? [validateFileField] : [],
     },
   },
   schema: {