Migrate all remaining cilium-cli workflows to run using Helm mode

[asauber]

As part of the Cilium CLI Helm mode implementation, a variety of the CI workflows were updated to run both a Helm-based implementation and "classic" implementation.

https://github.com/cilium/cilium-cli/blob/main/.github/workflows/gke.yaml#L41
https://github.com/cilium/cilium-cli/blob/main/.github/workflows/multicluster.yaml#L42

One of these was the first CI usage of the cilium upgrade subcommand.

https://github.com/cilium/cilium-cli/blob/main/.github/workflows/kind.yaml#L226

The goal of this task is to migrate all of the remaining workflows to use the Helm mode, in preparation for Helm mode becoming the default mode in the next release of cilium-cli

[michi-covalent]

opened draft PRs:

• eks: helm mode: Add EKS test coverage #1638
• eks tunnel mode: helm mode: Add EKS tunnel mode test coverage #1639
• external workloads: helm mode: Add external workloads test coverage #1640

@asauber i didn't touch https://github.com/cilium/cilium-cli/blob/main/.github/workflows/multicluster.yaml. i'm assuming you'll take care of it after #1628 gets merged ✨

[asauber]

@michi-covalent multicluster was completed a while back 41d8616 🙂

[michi-covalent]

oh wow things are moving at an amazing pace

[michi-covalent]

completed