Respect the file limit

Problem/Motivation

In the Webform module it is possible to set a max file size on individual file elements (ref. 🐛 Fix querying for maxFileSize of uploaded files Active ), but there is also a possibility to set a file upload limit per form. If the total size of uploaded files exceeds this limit the webform submission validation fails.

This is controlled by the form_file_limit setting in the webform configuration, and the global setting settings.default_form_file_limit.

Proposed resolution

We should also reject form submissions that exceeds the form file limit if the form is submitted through GraphQL.