feat(PN-9571): adaptation of drag and drop component to WCAG 2.2 standards

[SarahDonvito]

Short description

Added CTA in SingleFileInput component

Preview

List of changes proposed in this pull request

• Added button to component to make CTA more accessible
• Added prop for copy of button

Product

Piattaforma Notifiche -> SEND

How to test

Run storybook and go to SingleFileInput component to check that box has button to upload file

[ZorbaDimatteo]

@Carminepo2 @ruggerocastagnola Can you check this PR too?

[Carminepo2]

LGTM 👍