Upgrade Ubuntu agent version

[jbpaux]

What this PR does / why we need it:
closes #524
I have :

• Upgraded to latest Ubuntu version
• Fixed build issues related to these changes (upgrade cgroup for k8s)
• Cleaned sudo stuff as it gave errors because of locations of kubeconfig and are not needed
• Removed old K3S hack for 1.16 since weremoved it a while ago

I think there are quite other things to clean but not part of this PR I will open an issue later.

Special notes for your reviewer:

If applicable:

• this PR has an associated PR with documentation in akri-docs
• this PR contains unit tests
• added code adheres to standard Rust formatting (cargo fmt)
• code builds properly (cargo build)
• code is free of common mistakes (cargo clippy)
• all Akri tests succeed (cargo test)
• inline documentation builds (cargo doc)
• all commits pass the DCO bot check by being signed off -- see the failing DCO check for instructions on how to retroactively sign commits

[adithyaj]

Thanks for updating this and cleaning up the sudo/k3s workarounds we used to have. It looks good to me!

[adithyaj]

Instead of pushing it as the same version, I think we could bump the patch version since we're now only testing all the supported/non end-of-life versions of K8s and we cleaned up the tests too.

@kate-goldenring any suggestion on that?

[adithyaj]

/version patch