Use worker run to update worker activity

Depends arkindex/backend#1559 (closed)
Refs https://redmine.teklia.com/issues/3383

When the UpdateWorkerActivity endpoint supports worker run IDs as main reference, the ponos agent must use only that information.

added P2 label

assigned to @yschneider

This is now doable

changed the description

mentioned in merge request !388 (merged)

closed with merge request !388 (merged)