feat(eks): support for installing default networking add-ons

[badmintoncryer]

Issue # (if applicable)

Closes #30804.

Reason for this change

Description of changes

• Add bootstrapSelfManagedAddons prop to ClusterProps

Description of how you validated changes

Add both unit and integ tests.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[sumupitchayan]

Thanks for the PR @badmintoncryer - you mention adding unit tests in the PR description but I don't see them here?

[badmintoncryer]

@sumupitchayan Thanks! I've completely forgotten to add unit test. I've added it.

[sumupitchayan]

Thanks for the PR @badmintoncryer - I see from the CFN docs that by default, the networking addons include vpc-cni, coredns, and kube-proxy. Maybe instead the integ test should pass in bootstrapSelfManagedAddons: false and assert somehow that the addons were not installed?

[badmintoncryer]

@sumupitchayan Apologize for the delay.

Maybe instead the integ test should pass in bootstrapSelfManagedAddons: false and assert somehow that the addons were not installed?

I tried to add integ test and noticed that creating an EKS cluster by AWS CDK does not install any add-ons whether or not bootstrapSelfManagedAddons is enabled or not.

bootstrapSelfManagedAddons	installed add-ons
true	nothing
false	nothing
undefined	nothing

Official document says that default add-ons are always installed for the EKS cluster.

However, is my understanding correct that when creating an EKS cluster via CDK (eks.Cluster construct), no add-ons are installed?

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