Implement some signal from the operator that will mean "all good" in terms of operator

[l0kix2]

Currently we have Running cluster status, but it doesn't mean that operator finished all reconciliations.
For example cluster stays Running if full update couldn't start (if EnableFullUpdate not set for example) and it should be a way to detect such situations by human and/or monitoring without checking the logs.

Maybe we just should use other status then Running if operator is blocked and that would be enough.

• There is a separate related issue to have some signal that operator is fully satisfied applied spec, currently status could be running if minimal amount of pods are created, but I consider that as an independent issue. Though it also may be resolved with some extra status, which will mean "cluster is usable, but not everything is running".