Skip gateway TLS listener in passthrough mode

[vehagn]

Pull Request Motivation

I've tried to fix #6985 combining HTTPS listeners with TLS-termination and TLS listeners with TLS-passthrough that I reported earlier.

I'm unsure if this change will introduce unwanted behaviour, though all the tests are passing.

Kind

bug

Release Note

Skip Gateway TLS-listeners in passthrough mode

[cert-manager-prow]

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[cert-manager-prow]

Hi @vehagn. Thanks for your PR.

I'm waiting for a cert-manager 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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