No information logged if VM image or K8s version-downgrade was detected

[tobiscr]

Description

During testing the version up- and downgrade logic for VM-images/Kubernetes, it turned out that KIM was successfully ignoring an downgrade. But it was also not reporting this in the logs. We should write such version-gap at least as DEBUG message to the logs as it can be relevant for later debugging sessions.

AC:

• DEBUG message is printed which indicates that a image/Kubernetes version in RuntimeCR is lower as in Shoot-spec

Expected result

If KIM detects that the image/Kubernetes version in RuntimeCR is lower as in Shoot-Spec, it should write a log message indicating this difference.

Actual result

No information found in logs.

Steps to reproduce

Create RuntimeCR, wait until cluster was reconciled and reduce the image version in RuntimeCR.

Troubleshooting