WIP use JS-enhanced file upload

Relies on govuk_design_system_formbuilder gem merging this PR: x-govuk/govuk-form-builder#548

Author: DavidBiddle

app/components/question/file_component/view.html.erb

@@ -7,5 +7,7 @@
                                     text: question.hint_text,
                                     class: "govuk-!-margin-bottom-7"
                                   },
+                                  javascript: true,
                                   accept: Question::File::FILE_TYPES.join(", ")
+
 %>