Fix: nginx proxy server list not changed

[chengjoey]

What this PR does / why we need it:

The logic of updating the proxy server list seems to be unrelated to generateTemplate. If ssl-passthrough is enabled but the config has not changed, the proxy server list will not be updated. However, the service corresponding to passthrough may have changed. Therefore, the logic of updating the server list should be placed before onUpdate.

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 #11963

How Has This Been Tested?

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.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

This issue is currently awaiting triage.

If Ingress contributors determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

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[k8s-ci-robot]

Hi @chengjoey. 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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[netlify]

✅ Deploy Preview for kubernetes-ingress-nginx canceled.

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[rikatz]

/hold

We are going to deprecate TLS Passthrough on the next release, I wouldn't like to touch this for now.