Add version-pinned nightly testconfigs for OCP 4.21, 4.22, 4.23, and 5.0 on RHOSO

[tusharjadhav3302]

Summary

Adds 4 new job definition testconfig files for pre-GA OCP nightly validation on RHOSO 18.0, enabling version-specific regression detection independently of 4-stable.

• osp_verification_4.21_nightly.yaml — OCP 4.21 nightly
• osp_verification_4.22_nightly.yaml — OCP 4.22 nightly (explicit coverage after 4-stable rolls forward)
• osp_verification_4.23_nightly.yaml — OCP 4.23 pre-GA nightly
• osp_verification_5.0_nightly.yaml — OCP 5.0 pre-GA nightly

Each file is based on osp_verification.yaml with openshift_release pinned to the specific version and openshift_build_name: "" (resolves to latest nightly via the release stream API).

Context

• The existing osp_verification.yaml uses 4-stable which auto-resolves to the latest stable OCP. These new files supplement it by providing pinned nightly coverage per version.
• OCP 4.22+ is only supported on RHOSO, so these jobs will run on the RHOSO Zuul periodic pipeline (serval70).
• Corresponding Zuul job entries will be added in a separate ci-framework-jobs MR.

Related

• Epic: OSPRH-31438
• Tasks: OSPRH-31439, OSPRH-31440, OSPRH-31441, OSPRH-31442
• Slack thread: https://redhat-internal.slack.com/archives/C04UEUYPN69/p1778758938890989

[sauragar]

@tusharjadhav3302 can you please check the comments made by @imatza-rh ?

[tusharjadhav3302]

Successful zuul job run : https://sf.apps.int.gpc.ocp-hub.prod.psi.redhat.com/zuul/t/components-integration/build/885513330419498ab9b980156d5f59f8/console