feat: Improve cluster size feedback

[Techassi]

Alright, but it's a good and valid point!
Going forward I would like our stack and demo command waits for our product to be ready. In this place we can show the user the Pod events in the case the stack does not properly start. This could e.g. include 0/10 nodes sufficient memory etc.

Originally posted by @sbernauer in #94 (comment)