Add an option to reuse successful 'with-items' actions if a task failed

Now if we run a 'with-items' task and it fails then all of its actions get ignored if we run this task again (e.g. with 'retry' policy).

We can add an option to reuse successful actions in the next iteration of 'with-items' task.

Example:

my_wf:
  tasks:
    task1:
      with-items: i in <% range(0, 100) %>
      action: some_action param=<% $.i %>
      reuse-actions: true

A simple scenario when this behavior would be useful is when we need to create a lot of heavy resources (VMs, storages, etc.) and most of them are created successfully and some are not. It doesn't make sense to ignore successfully created resources and start creating them all again from scratch.