manchette: add fit button

[clarani]

closes https://github.com/osrd-project/osrd-confidential/issues/636

Description

The header represents the spatial axis of the Space-Time Diagram (GET). From the header, there should be a FIT button that allows switching to a view where the entire path is displayed.
On the first render, the selected train must be optimally displayed horizontally.

Acceptance Criteria

• The user has a button to reset the zoom level in order to see a train in its entirety.
• On the first render, the user can see the selected train in full.
• On the first render, the horizontal scale must be adjusted to the trains in the timetable.

Implementation Plan

osrd-ui (size 0.75)

• In the header, add a button to dispatch an event that resets the scale.
• In the Header+GET component, add logic to:
  • Adjust the maximum allowed zoom level on the GET.
  • Modify the vertical scales (space) when clicking the button.
  • Modify the horizontal scale (time) for the first render.

osrd (size 0.25)

• Integrate the new version of the header, providing the new props if necessary.