Enter in failing_fast mode if the user interrupts the execution.

**Describe the feature you'd like**
Enter in ``failing_fast`` mode if the user interrupts the execution.

However this is *far* from being been trivial because we need to make the asynchronous interrupt into a synchronous one.

Because the user could interrupt the middle of an execution because it is too slow, this one must be canceled and then enter in ``failing_fast``.

There are much more corner cases. Brainstorming needed here!