Ignore nodes outside configured region

[benturnkey]

What type of PR is this?
/kind feature

What this PR does / why we need it:

The AWS cloud provider now ignores nodes whose providerID points to a different AWS region than the controller's configured region when checking instance existence or shutdown state.

Which issue(s) this PR fixes:

Addresses #939 by preventing controllers from interfering with nodes it doesn't own.

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

The AWS cloud provider now ignores nodes whose `providerID` points to a different AWS region than the controller's configured region when checking instance existence or shutdown state.

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[k8s-ci-robot]

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[k8s-ci-robot]

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.