Azure Testing - support both Node 10/12 and Cold/Warm Start Detection

Azure Testing - now supports Node versions 10 & 12
Azure Testing - removed "warm" hardcoding and now supports both Cold/Warm Start Detection automatically - discarding any function results for the warm-start function if it was started in cold-start state and vice-versa (this is due to how we had to detect cold/warm vs. how we do it in AWS which is more flexible - see readme)