Check pod status in e2e tests

**What would you like to be added**:
Check pod status in e2e tests after creation/upgrades.

**Why is this needed**:
This way we would come to know about status for pods that could be potentially crashing even after successful cluster creation.

Start by locating the end-to-end tests that cover cluster creation and upgrades, then read how those tests currently determine success. Add pod-status verification to those flows so pods that crash after a successful operation are reported; done means the tests detect and surface unhealthy pod status.

Written by the indexing model from the issue text.