Move the New configuration button to the top of the list

https://redmine.teklia.com/issues/8499

In the worker configuration modal, the New configuration button should be at the top of the list, between No configuration and the existing configurations.

changed milestone to %Arkindex 1.7.2

added Good first bug P3 Quick Win labels

assigned to @mlbonhomme

mentioned in merge request !1835 (merged)

closed with merge request !1835 (merged)