[back][front] feat: add a setting to control the weekly col. goal on mobile

[GresilleSiffle]

Description

In the branch main the weekly collective goal is displayed by default on mobile. This widget takes up a lot of space, and reduce the space available for the sliders and the future comparison buttons. On some devices, the submit button is not visible without scrolling.

The comparison buttons, and the mobile UI in general, would greatly benefit from more space by default, especially when an entity context is displayed. This PR adds a new setting that controls the display of the weekly collective goal on mobile, and set the default value to false (not displayed on mobile devices). This way it's possible for a user to have the widget enabled on desktop, and disabled on mobile.

It should make the UI more simple and more friendly with new users.

before	after

Checklist

• I added the related issue(s) id in the related issues section (if any)
  • if not, delete the related issues section
• I described my changes and my decisions in the PR description
• I read the development guidelines of the CONTRIBUTING.md
• The tests pass and have been updated if relevant
• The code quality check pass