eks: Run cilium-cli inside a container

[michi-covalent]

Update {eks,eks-tunnel}.yaml to run cilium-cli inside a container instead of using cilium-cli-test-job-chart.

Ref: #2623 Ref: #2627 Ref: cilium/design-cfps#9

[michi-covalent]

✅ success

• eks: https://github.com/cilium/cilium-cli/actions/runs/9672643155/job/26685298688?pr=2631
• eks tunnel: https://github.com/cilium/cilium-cli/actions/runs/9672643150/job/26685413902?pr=2631

marking it ready for review