Allow specifying the same certificate for both default and SNI

[u-kai]

Issue

#3070

Description

As described in issue #3070, previously a certificate selected as the default certificate could not also be selected as an SNI certificate.
However, according to ALB specifications, this configuration is allowed and there is a real use case demand for it.
Therefore, this PR modifies the behavior to allow the same certificate to be used for both the default and SNI.

The image shows the deployment of an Ingress with the following annotation configured.

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-sample
  annotations:
    alb.ingress.kubernetes.io/certificate-arn: arn:aws:acm:ap-northeast-1:xxxxxxxxxxxx:certificate/23cecxxxxxxxxx,arn:aws:acm:ap-northeast-1:xxxxxxxxxxx:certificate/0796adxxxxxxxxx,arn:aws:acm:ap-northeast-1:xxxxxxxxxxxxx:certificate/23cecxxxxxxxx
....

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: u-kai
Once this PR has been reviewed and has the lgtm label, please assign zac-nixon for approval. For more information see the Code Review Process.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @u-kai. 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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[zac-nixon]

/ok-to-test
/lgtm
/approved.

Seems good to me. Thanks for taking the time to submit this!

[u-kai]

@zac-nixon
Thank you for your review!
The test failed due to a timeout, so I'll try running it again.

[u-kai]

/retest

[u-kai]

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

[u-kai]

@zac-nixon
I re-ran the test and it passed.
However, the approval label hasn’t been added yet, so the process hasn’t moved forward. Is there anything else I should do?