feat: add e2e conformance test step for Konflux on OpenShift

[amisstea]

Add a new konflux-ci-e2e-tests step ref that runs the e2e conformance test suite after the operator is installed on OpenShift. The step sources test environment defaults, configures credentials, deploys test resources, and runs the conformance suite with ginkgo.

Wire the new step into the main, ocp420, and ocp420-arm64 test configs so it runs after konflux-ci-install-operator.

Assisted-by: Claude claude-opus-4-6

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: amisstea
Once this PR has been reviewed and has the lgtm label, please assign kasemalem for approval. For more information see the Code Review Process.

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Details

Needs approval from an approver in each of these files:

• ci-operator/config/konflux-ci/konflux-ci/OWNERS [amisstea]
• ci-operator/step-registry/konflux-ci/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@amisstea: the pj-rehearse plugin accommodates running rehearsal tests for the changes in this PR. Expand 'Interacting with pj-rehearse' for usage details. The following rehearsable tests have been affected by this change:

Test name	Repo	Type	Reason
pull-ci-konflux-ci-konflux-ci-main-konflux-e2e-v420-arm64-optional	konflux-ci/konflux-ci	presubmit	Ci-operator config changed
pull-ci-konflux-ci-konflux-ci-main-konflux-e2e-v420-optional	konflux-ci/konflux-ci	presubmit	Ci-operator config changed
periodic-ci-konflux-ci-konflux-ci-main-ocp420-konflux-e2e-v420	N/A	periodic	Ci-operator config changed
periodic-ci-konflux-ci-konflux-ci-main-ocp420-arm64-konflux-e2e-v420-arm64	N/A	periodic	Ci-operator config changed

Prior to this PR being merged, you will need to either run and acknowledge or opt to skip these rehearsals.

Interacting with pj-rehearse

Comment: /pj-rehearse to run up to 5 rehearsals
Comment: /pj-rehearse skip to opt-out of rehearsals
Comment: /pj-rehearse {test-name}, with each test separated by a space, to run one or more specific rehearsals
Comment: /pj-rehearse more to run up to 10 rehearsals
Comment: /pj-rehearse max to run up to 25 rehearsals
Comment: /pj-rehearse auto-ack to run up to 5 rehearsals, and add the rehearsals-ack label on success
Comment: /pj-rehearse list to get an up-to-date list of affected jobs
Comment: /pj-rehearse abort to abort all active rehearsals
Comment: /pj-rehearse network-access-allowed to allow rehearsals of tests that have the restrict_network_access field set to false. This must be executed by an openshift org member who is not the PR author

Once you are satisfied with the results of the rehearsals, comment: /pj-rehearse ack to unblock merge. When the rehearsals-ack label is present on your PR, merge will no longer be blocked by rehearsals.
If you would like the rehearsals-ack label removed, comment: /pj-rehearse reject to re-block merging.