Allow Services in multiple namespaces within a ForwardConfig/TargetGroup

[kevinfrommelt]

Description

Add the ability to target Services in different namespaces within a FowardActionConfig.TargetGroupTuple by providing an optional ServiceNamespace field. When this field is not provided, the namespace will default to the namespace of the Ingress object as it did before.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kevinfrommelt
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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @kevinfrommelt. 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.

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[oliviassss]

/ok-to-test

[kevinfrommelt]

/retest

[kevinfrommelt]

/test pull-aws-load-balancer-controller-e2e-test

[kevinfrommelt]

@oliviassss I rebased onto latest and retested. This is ready for review again.