front: combobox v2 for new itinerary modal

[RomainValls]

closes #14241 part of https://github.com/osrd-project/osrd-confidential/issues/1166

This PR only is about :

• developing the new ListElementComponent (custom combo box suggestions list), and having a story displaying it.
• developing a function filtering the path items according to the ACs.

[flomonster]

When testing, I could not edit path items of trains. I suppose that is not part of this PR. Could you add a bit more description :pray:

[RomainValls]

#14241

Indeed, at the moment, it's only about developing the "custom combo box" in ui, and to have a story displaying it. Editing path items will arrive in a future PR. I'm also adding a bit of description to this PR 👍

[flomonster]

With a lot of CH codes we have an horizontal and vertical scroll bar:

[RomainValls]

With a lot of CH codes we have an horizontal and vertical scroll bar:

Thanks, I've added a max-width to the secondary codes.