[FEATURE REQ] Add Subnet info to KubernetesCluster class

**Is your feature request related to a problem? Please describe.**
Get subnet from KubernetesClass

**Describe the solution you'd like**
something like.... getSubnet() ? Even as a string is enough for me. I just want to see the linked subnet.

**Describe alternatives you've considered**
NetworkProfile doesn't give me the correct info.

**Information Checklist**
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- [x] Description Added
- [x] Expected solution specified