test(customheaders): add test for annotation added

[qvalentin]

What this PR does / why we need it:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

fixes #11680.
reproduces the issue with a e2e test.
Based on #11709. I just added the e2e test.

How Has This Been Tested?

The existing e2e did only test the customheaders annotation on an newly created ingress.
This pr adds a second e2e tests that tests what happens, when the annotation is added to an existing ingress.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[linux-foundation-easycla]

• ✅login: jgoelen / (4cbaa41)
• ✅login: jgoelen / (4cbaa41, 1280f56)
• ✅login: jgoelen / (4cbaa41, 1280f56, c259b47)
• ✅login: jgoelen / (4cbaa41, 1280f56, c259b47, 67f4c98)
• ✅login: jgoelen / (4cbaa41, 1280f56, c259b47, 67f4c98, 261b26b)
• ✅login: jgoelen / (4cbaa41, 1280f56, c259b47, 67f4c98, 261b26b, 6cfd223)
• ✅login: qvalentin / (1d3b302)
• ✅login: qvalentin / (1d3b302, bf56d56)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: qvalentin
Once this PR has been reviewed and has the lgtm label, please assign strongjz for approval. For more information see the Kubernetes Code Review Process.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @qvalentin. Thanks for your PR.

I'm waiting for a kubernetes 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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[strongjz]

/kind bug
/ok-to-test
/triage accepted
/priority backlog