[IM2-K8s] Connect to job functionality

[DanThrane]

Add the "Connect to job" functionality (also known as peers) to the Kubernetes integration. This will require changing the associated code around the NetworkPolicy and the linked hostnames into the container. I don't think we need a fully separate file for this feature, like the old codebase has.

The existing codebase should serve as a good reference: https://github.com/sdu-escience/ucloud/blob/456e66afaefe433cdd770e8cf042dbc2a6b31dcf/provider-integration/integration-module/src/main/kotlin/plugins/compute/ucloud/FeatureFirewall.kt#L15