[release-4.12] Add e2e test for hosted cluster behind a proxy

[openshift-cherrypick-robot]

This is an automated cherry-pick of #2077

/assign enxebre

[bryan-cox]

/lgtm

[enxebre]

/approve

[openshift-ci]

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[ART PR BUILD NOTIFIER] (beta)

This PR has been included in build ose-hypershift-container-v4.12.0-202303061432.p0.gad7fb3f.assembly.stream for distgit hypershift.
All builds following this will include this PR.