Bugfix: Fix ingress passed to postUpgrade

[skmatti]

The upgrade test is failing with the following error:
basic_http.go:106: error updating Ingress test-sandbox-f00f98973031357/ing1: Operation cannot be fulfilled on ingresses.networking.k8s.io "ing1": the object has been modified; please apply your changes to the latest version and try again

Ingress upgrade is failing if we pass in ingress returned by k8s API server to CRUD framework.
This PR updates ingress object passed to PostUpgrade step, back to ingress generated by IngressBuilder.

/assign @MrHohn @rramkumar1

[k8s-ci-robot]

Hi @skmatti. Thanks for your PR.

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[MrHohn]

/ok-to-test

[MrHohn]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MrHohn, skmatti

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