chore(eks): add support for TRN1, TRN1N, TRN2, P5, P5E, P5EN instance types

[pahud]

Issue # (if applicable)

Closes #35914.

Reason for this change

Users cannot create EKS managed node groups with newer GPU and accelerator instance types (Trainium TRN1/TRN1N/TRN2 and P5/P5E/P5EN series). The isGpuInstanceType() validation function does not recognize these instance types, causing validation errors that block deployment.

Description of changes

Updated the isGpuInstanceType() function in packages/aws-cdk-lib/aws-eks/lib/private/nodegroup.ts to recognize 6 additional GPU and accelerator instance types:

Trainium Instances (AWS Neuron accelerators):

• TRN1, TRN1N, TRN2

P5 Series GPUs (NVIDIA H100):

• P5, P5E, P5EN

The implementation adds these instance classes to the existing knownGpuInstanceTypes array, maintaining logical grouping (P-series together, TRN-series as new group). This enables proper AMI type selection (AL2023_X86_64_NEURON for Trainium, AL2023_X86_64_NVIDIA for P5).

Before:

cluster.addNodegroupCapacity('TrainiumNodes', {
  instanceTypes: [new ec2.InstanceType('trn1.2xlarge')],
});
// Error: The specified AMI does not match the instance types architecture

After:

cluster.addNodegroupCapacity('TrainiumNodes', {
  instanceTypes: [new ec2.InstanceType('trn1.2xlarge')],
});
// Works correctly - AL2023_X86_64_NEURON AMI automatically selected

cluster.addNodegroupCapacity('P5Nodes', {
  instanceTypes: [new ec2.InstanceType('p5.48xlarge')],
});
// Works correctly - AL2023_X86_64_NVIDIA AMI automatically selected

Describe any new or updated permissions being added

N/A - This change only updates client-side validation logic. No IAM permissions or resource access changes.

Description of how you validated changes

• Unit tests: Added 6 new instance types to the GPU instance type test array in nodegroup.test.ts. All 365 unit tests pass with zero regressions.
• Integration tests: Not required - this is a validation-only change. Existing integration test patterns (integ.eks-inference-nodegroup.ts) demonstrate the correct usage for accelerator instances.
• Build verification: TypeScript compilation, linting, and full build all pass successfully.
• Test coverage: Maintained at 48.61% (pre-existing baseline).

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