Make end-to-end scenario work for arrival on stop signal

[woshilapin]

Description and goal

There are multiple different moving pieces in the front, editoast and core, in order to make arrival on stop signal a reality. Let's glue all of it together and check that everyting works as expected.

Acceptance criteria

• [ ] it's possible to create a scenario in the UI, that create conflict without the arrival on stop signal, but without any conflict once the option is enabled