[Feature] add support for us-isof and eu-isoe regions

[jdwtf]

What feature/behavior/change do you want?

Need to add support for new regions us-isof and eu-isoe

Why do you want this feature?

To enable the use of eksctl in these regions

[github-actions]

Hello jdwtf 👋 Thank you for opening an issue in eksctl project. The team will review the issue and aim to respond within 1-5 business days. Meanwhile, please read about the Contribution and Code of Conduct guidelines here. You can find out more information about eksctl on our website

[jdwtf]

similar past issue #5656

[jdwtf]

#8112 under review