Feature: #95486 - Add accept argument for UploadViewHelper

See Issue #95486

Description

It is now possible to pass file types via “accept” as argument directly to the UploadViewHelper. Previously this had to be done by using “additionalAttributes”. This way it can be defined which file types are allowed for uploads, to prevent unwanted file formats.

Example

<f:form.upload accept=".jpg,.png" />