OSDOCS-24080: Add 4.19.54 z-stream release notes - #123556

In response to this:

Summary

• Adds z-stream release notes for OCP 4.19.54 (advisory-only)
• Jira: https://redhat.atlassian.net/browse/OSDOCS-24080
• Shipment MR: https://gitlab.cee.redhat.com/hybrid-platforms/art/ocp-shipment-data/-/merge_requests/1101
• ART Dashboard: https://art-dash.engineering.redhat.com/dashboard/release/openshift-4.19
• Errata: RHBA-2026:92280 / RHBA-2026:92281 (live_id; not yet on access.redhat.com at PR open)

Documented

• None (advisory-only)

Skipped (not documented)

Key	Reason
—	No OCPBUGS keys in shipment image YAML

Jira RN text populated (pre-step)

No issues required RN text population (0 auto-closed, 0 CCFR rewritten, 0 copied from clone, 0 CCFR written).

Scope notes

• Shipment YAML keys: 0
• Advisory-only module with stock "no notable fixed issues" text
• Issued date set to planned ship date from shipment MR (4 November 2026)

Test plan

• Title and issued date match access.redhat.com when published
• Primary + companion advisory links correct
• Vale clean on touched files

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