docs(kic): add konnect integration troubleshooting section

[czeslavo]

Description

Adds a Konnect integration section to the troubleshooting guide.

Testing instructions

Preview link: https://deploy-preview-7853--kongdocs.netlify.app/kubernetes-ingress-controller/latest/reference/troubleshooting/#debugging-konnect-integration

Checklist

• [x] Review label added
• [x] Conditional version tags added, if applicable.

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