Refactor action result processing (make it as a pipeline)

Make action result processing pipeline more granular and clear. Now it’s hard to track how action result processing happens whereas it’s obviously a cascade processing when we have a chain of objects whose states are sequentially related: Object1 influences state of Object2, Object2 influences state of Object3. In our case Object1 - action execution, Object2 - task execution, Object3 - workflow execution. We need to reflect this pattern well in the code.

This will increase maintainability significantly.