test/e2e-techpreview: add tests for PinnedImageSets

[hexfusion]

This PR adds basic e2e testing for the TechPreview PinnedImageSet feature.

[hexfusion]

/hold

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hexfusion
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[hexfusion]

/test e2e-gcp-op-techpreview

[hexfusion]

/test e2e-gcp-op-techpreview

[openshift-ci]

@hexfusion: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-ovn-upgrade-out-of-change	957a69a	link	false	/test e2e-aws-ovn-upgrade-out-of-change
ci/prow/e2e-gcp-op-techpreview	957a69a	link	false	/test e2e-gcp-op-techpreview

Full PR test history. Your PR dashboard.

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[openshift-merge-robot]

PR needs rebase.

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