Fixed Ingress banner wrongfully shown on edit

[eva-vashkevich]

Summary

Fixes #15950

Fixed "Before switching to Traefik, please review our migration documentation Opens in a new tabto ensure your Ingress resources are updated to support Traefik’s configuration requirements." warning banner appearing on cluster creation.

Occurred changes and/or fixed issues

There was a typo in isEdit making the check wrong.

Technical notes summary

Areas or cases that should be tested

Go to create an RKE2 cluster -> Ingress
Switch between nginx and traefik a few times. the warning banner should not appear under the ingress selection cards.
It should till appear when switcihng between selections on edit.

Areas which could experience regressions

None

Screenshot/Video

Checklist

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[Copilot]

Pull request overview

Fixes the ingress migration warning banner being shown during RKE2 cluster creation by correcting the edit-mode check so the banner logic only triggers when editing an existing cluster.

Changes:

• Fixes the isEdit check in the ingress selection handler by using the computed value (isEdit.value) instead of the computed ref object.
• Prevents the Traefik migration banner from being incorrectly triggered in create mode when switching ingress selections.

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