Migrate the setup of k8s examples to Jumppad

[dadrus]

Preflight checklist

• [X] I agree to follow this project's Code of Conduct.
• [X] I have read and am following this repository's Contribution Guidelines."
• [ ] I have discussed this feature request with the community.

Describe the background of your feature request

Currently, the setup for Kubernetes-based examples relies on Just. While this approach was manageable initially, the growing number of additional scripts, services, and dependencies required to spin up the environment has made it increasingly difficult to maintain. Additional known limitations are:

• Lack of support for Windows due to the reliance on Bash and Linux-specific commands.
• Even on macOS, these dependencies can create challenges in setting up the environment.
• Load balancer setup is unreliable, often requiring manual intervention depending on local system configurations.

Describe your idea

Switch to using Jumppad, a tool specifically designed to simplify the process of spinning up and configuring environments.

Are there any workarounds or alternatives?

Terraform might be an option

Version

0.15.3

Additional Context

No response