feat(eks): add support for Kubernetes version 1.34

[pahud]

Issue # (if applicable)

Closes #35717

Reason for this change

Amazon EKS now supports Kubernetes version 1.34. CDK users need the ability to create EKS clusters with this latest managed Kubernetes version to take advantage of new features and improvements.

This PR adds the 1.34 support for both aws-eks and aws-eks-v2-alpha modules.

Description of changes

This PR adds support for Kubernetes version 1.34 to aws-eks and aws-eks-v2-alpha modules.

Changes made:

• Added KubernetesVersion.V1_34 constant to stable EKS module (aws-cdk-lib/aws-eks)
• Added KubernetesVersion.V1_34 constant to alpha EKS module (@aws-cdk/aws-eks-v2-alpha)
• Updated integration test framework to support v1.34 with kubectl-v34 layer
• Added dependency on @aws-cdk/lambda-layer-kubectl-v34@^2.0.0

Implementation details:

• 6 files modified (4 core files + 2 integration test files)
• 23 insertions, 2 deletions
• Purely additive change with zero breaking changes
• Maintains full backward compatibility with all existing versions (1.29-1.33)

Usage example:

import * as eks from 'aws-cdk-lib/aws-eks';
import { KubectlV34Layer } from '@aws-cdk/lambda-layer-kubectl-v34';

const cluster = new eks.Cluster(this, 'MyCluster', {
  version: eks.KubernetesVersion.V1_34,
  kubectlLayer: new KubectlV34Layer(this, 'KubectlLayer'),
});

Describe any new or updated permissions being added

N/A - No IAM permissions or resource access changes. This is a version constant addition only.

Description of how you validated changes

• Unit tests: All 365 existing unit tests pass without modification. The existing test suite validates version constant enumeration and format.
• Integration tests: Integration test framework updated and validated:
  • Added kubectl-v34 layer dependency to test package
  • Updated version mapping configuration
  • Integration tests ready to generate snapshots in CI/CD
  • Build successful with zero errors
• Build validation:
  • TypeScript compilation: No errors
  • JSII compatibility: Verified
  • ESLint: Passed
  • All builds successful

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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