Fix bug where form's `novalidate` attribute is not respected

app/assets/javascripts/gl_field_errors.js

@@ -31,11 +31,15 @@ class GlFieldErrors {
    * and prevents disabling of invalid submit button by application.js */
 
   catchInvalidFormSubmit (event) {
+    const $form = $(event.currentTarget);
+
+    if (!$form.attr('novalidate')) {
       if (!event.currentTarget.checkValidity()) {
         event.preventDefault();
         event.stopPropagation();
       }
     }
+  }
 
   /* Public method for triggering validity updates manually  */
   updateFormValidityState() {