Add CiliumEniModeClusterBuilder

[AndiDog]

What does this PR do?

Towards giantswarm/roadmap#2563

Checklist

• CHANGELOG.md has been updated

[AverageMarcus]

@AndiDog Do we really need a whole builder for this? This is something that could be done in a single test suite if that's the intention. Do you expect this to be used outside of cluster-test-suites? (e.g. with app tests and with CNCF Conformance)

[AndiDog]

@AndiDog Do we really need a whole builder for this? This is something that could be done in a single test suite if that's the intention. Do you expect this to be used outside of cluster-test-suites? (e.g. with app tests and with CNCF Conformance)

@AverageMarcus I wasn't sure. We have a builder for private clusters, for instance. Where else do we use these builders overall? I'm fine to instead use the standard builder and overriding the 2 Helm values in cluster-test-suites.

[AverageMarcus]

We have a different builder for private because it also requires a different MC.

I think until we need to use this cluster configuration with anything other than cluster-test-suites it might be better to just have it as override values in the test suite in cluster-test-suites. It's easy enough to move it out if and when we do need to. 😄

That also means that you don't need to deal with new releases of this module to be able to make changes to it in cluster-test-suites.

What do you think? I'm happy either way, just sharing my opinion.

[AndiDog]

Yep makes sense.