feat(migration): added a new script that add the freeWorkShop field as a...

Related to pamn_client#303 (closed)

What does this MR do and why?

Updates the following migration scripts:

• remove-covid-infos : add try catch
• initializefreeworkshop: go through every structure to set the freeworkshop attribute inside of the categories array
• addfreeworkshopcategory: creates a new object in the categories collection
• changedemarchestheme: theme of Démarches en ligne changed to Compétences numériques

Resources

Pour la key freeWorkShop

• 4 cas normaux ('Oui', 'Oui, sous condition', 'Non', et null)
• 1 cas anormal ('underCondition' -> id: 60ab72656a9d4500313b865d)

Mathieu avait aussi repéré un false, mais pas vu