front: clean date manipulation in TS v2

[clarani]

Description and goal

The date manipulation in TS v2 is quite shady for the moment. Sometimes, the date received from editoast is formatted several times, but it should be formatted only once at the end, just before displaying it.

The date in ts v2 is displayed at least in the following components:

• timetable card
• get
• output table
• driver schedule

Note

The transformation process is weird, for example the train.startTime process is as follows 🤯:

1. String ISO8601
2. Dayjs obj
3. String custom DD/MM/YYYY HH:mm:ss
4. Date obj
5. Dayjs obj
6. String custom DD/MM HH:mm:ss

Acceptance criteria

• the date is formatted only once for each workflow