test: add label cleanup coverage to pr-open workflow

[DerekRoberts]

Summary

Adds test coverage for .pr-close.yml using cleanup: label.

Three new jobs in pr-open.yml:

• label-setup: creates a ConfigMap labeled app=quickstart-openshift-helpers-<PR#> and verifies it exists
• label-cleanup: calls .pr-close.yml with cleanup: label only — no cleanup_name, exercising the default (repo name)
• label-verify: confirms no resources remain with that label after cleanup; fails if any are found

results job updated to gate on label-verify.

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Pull request overview

This PR extends the PR-open GitHub Actions workflow to add coverage for the reusable .pr-close.yml workflow’s label-based cleanup path by creating a labeled OpenShift resource, invoking cleanup, and verifying deletion.

Changes:

• Add label-setup, label-cleanup, and label-verify jobs to exercise .pr-close.yml with cleanup: label (no cleanup_name override).
• Create a labeled ConfigMap in OpenShift and verify it exists pre-cleanup.
• Gate the results job on label-verify to ensure cleanup verification is part of the workflow outcome.

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