Add new paced train

[SharglutDev]

Description and goal

Update the current interface to add train to be able to add a unique train or a paced train.

Ppt mockup here : https://sncf.sharepoint.com/:p:/r/sites/OSRD644GrpO365/Documents%20partages/PO/Groupes%20et%20familles%20de%20trains/Maquette%20mission%20PI14.pptx?d=wfceedf5d80034b0aaed5e9ba4dff9dfd&csf=1&web=1&e=Tbb4nc

Note

The ppt mockup doesn't provide any specific style, it's more of a functional mockup

This interface should also have end to end tests.

End to end tests strategy (details here : https://github.com/osrd-project/osrd-tests/issues/89)

• The old test 005-operational-studies.spec.ts should be replaced by the one in the linked issue
• Every requirements of the tests should be done until the 6. part included

Acceptance criteria

• When service mode is off, we can still create a regular train
• There is a new checkbox below the submit button to switch the form between unique train and paced train
• The checkbox is unchecked by default
• In service mode, there is a new field Duration of the repetition time range ("Durée de la plage de répétition")
• In service mode, there is a new field Cadence of the service ("Cadence de la mission")
• The duration field is in minutes and is filled with 120min by default
• The cadence field is in minutes and is filled with 60min by default
• Both these fields are saved in the store
• When the checkbox is checked, the main "Add" button, shows Add a service ("Ajouter une mission")
• New e2e tests have been added and follow the strategy in description