r/aws_instance: Remove `cpu_core_count` and `cpu_threads_per_core`

[ewbankkit]

#31035 deprecated the cpu_core_count and cpu_threads_per_core attributes for v5.0.0 of the Terraform AWS Provider.
Remove the attribute in a future version.

[github-actions]

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[krishnaduttPanchagnula]

Hi @ewbankkit I have raised a PR,please mention if there are more changes to be done. Also i wanted to update the .changelog but was unable to understand how to number the .txt file. Can you please help or point to document, how you in this repository.

[YakDriver]

Closed by #42280

[github-actions]

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