add immutability check for nodegroup fields

[rushmash91]

Description of changes:

• Uses runtime/code-gen v0.44.0
• Enhances nodegroup field validation by marking immutable fields:
  • AmiType
  • InstanceTypes
  • ClusterName
  • Name

Prevents modifications that EKS does not allow to be changed after creation.

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

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rushmash91

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[ack-prow]

@rushmash91: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
eks-verify-attribution	3d5d33c	link	false	/test eks-verify-attribution
eks-kind-e2e	3d5d33c	link	true	/test eks-kind-e2e

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