🌱 net/natgws: introduce test units for nat gateways

[mtulio]

Increase the tests coverage in the lookup nat gateway method.

This is a sub set of changes for edge zone feature, introduced in the wAvelength PR
#4901

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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Checklist:

• squashed commits
• includes documentation
• includes emojis
• adds unit tests
• adds or updates e2e tests

Release note:

[k8s-ci-robot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @mtulio. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[mtulio]

Closing this PR as it is isolated in a dedicated commit in the PR #4901