[a11y] Slash - disabled attribute doesn't have an impact on input's design

[MartinWeb]

When we set the disabled attribute for the file input, the input is indeed disabled but there's no modification of the input's design.

Actual :

Expected :

[MartinWeb]

One fix had been attempted on react-toolkit but it was never merged. We can inspire ourself on it
AxaFrance/react-toolkit#1052

[BenzakourOmar]

@JLou je la prend!

[MartinWeb]

Vu avec @adrien-dos on ne gère pas le mode désactivé sur le composant File. Je clôture