Disable “Go to Form” button after submission deadline

### Description

Currently, users are still able to open forms from their Altinn inbox even after the `dueBefore` deadline for submission has passed.

It would be useful to add logic that disables (or removes) the “Go to form”/"Gå til skjemautfylling" button once the submission deadline has expired.

Allowing users to start filling out a form that can no longer be submitted does not provide a meaningful user experience and may cause confusion.

### Additional Information

**Suggested behavior:**
If the current date is later than the dueBefore property, the “Go to form” button should be disabled.

Start by locating the inbox implementation that renders the “Go to Form”/“Gå til skjemautfylling” button and tracing how the dueBefore property is exposed to it. Verify the behavior around an expired deadline, then run the relevant frontend tests; done means users cannot open the form after dueBefore has passed.

Written by the indexing model from the issue text.