chore(eks): error message for ami type

[msambol]

Currently, if you select the wrong AMI type you get the following:

Error: The specified AMI does not match the instance types architecture, either specify one of AL2_x86_64, BOTTLEROCKET_x86_64, WINDOWS_CORE_2019_x86_64, WINDOWS_CORE_2022_x86_64, WINDOWS_FULL_2019_x86_64, WINDOWS_FULL_2022_x86_64 or don't specify any

IMO the error messages should give the enum values defined here, not the string value.

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[msambol]

Exemption Request: I'm only updating error message formatting.

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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