fix(flow): consider to fail a parent not in waiting-children

[roggervalf]

Why

1. Why is this change necessary? When failing a parent we are only considering that it can only be in waiting-children. If it's in another state we do not fail it. This is in the case where failParentOnFailure is true. But we can dynamically add jobs when a parent is active. We should consider to fail a parent later.

How

1. How did you implement this? A child can be in 4 different stages:

• unprocessed - dependencies key
• processed successfully - processed key
• processed unsuccessfully and ignored - failed key
• processed unsuccessfully and not ignored - (new key being added as unsuccessful)

When a child with failParentOnFailure is true and this child fail. As it's required to pass a job to waiting-children to verify that all children are completed to continue, we can validate if unsuccessful key has a len greater than 0 to move it to failed instead of waiting-children. Take in count that if users do not use moveToWaitingChildren method, parent would fail anyway as not all children will be completed.

Additional Notes (Optional)

Any extra info here.