Mistral should not be able to rerun task with on-error branch

[Oleg Ovcharuk]

If the task has either "on-error" branch, we should not be able to rerun it.
Let's consider this example:

{
    "version": "2.0",
    "wf": {
        "tasks": {
            "t1": {
                "action": "some_unstable_action",
                "on-error": "t2",
                "on-success": "t3"
            },
            "t2": {
                "action": "std.fail"
            },
            "t3": {
                "action": "std.fail"
            }
        }
    }
}

If t1 failed, wf will be failed by t2. In this situation we can rerun t1, and there will be 2 similar on-error branches. We can do it multiple times and there will be many equal branches from 1 task.
Let's imagine that one more rerun changed the situation and t1 was completed successfully. So there are multiple on-error branches and one on-success branch from one time on the same time!

This is not OK. Rerunning tasks with already handled errors should be restricted.