Add documentation for opting out of release-5.0 to release-4.23 fast-forwarding

[redhat-chai-bot]

Adds a new how-to page documenting the process for optional operator teams to opt out of automated fast-forwarding from release-5.0 to release-4.23.

Content

• Background — explains the repo-brancher-controller and why teams might opt out
• Timeline — before/after branch cut (August 14, 2026) behavior
• How to opt out — step-by-step: locate config, add to ignore list, submit PR
• Ignore list matching — documents org, repo, source, target selectors
• What happens after opting out — team responsibilities
• Tracking — links to DPTP-4980

Requested by the Test Platform team in the forum-ocp-testplatform discussion about DPTP-4980.

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AI-generated. Review for accuracy.

@jmguzik requested in Slack thread

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@redhat-chai-bot: The following test 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/links	0a7e102	link	true	/test links

Full PR test history. Your PR dashboard.

Details

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[redhat-chai-bot]

The ci/prow/links failures are not caused by this PR's content:

1. 404 on https://github.com/openshift/ci-docs/tree/main/content/en/how-tos/opting-out-of-fast-forwarding.md — This is the Docsy theme's auto-generated "Edit this page" link. It points to the main branch, but the file only exists on this feature branch. This will resolve automatically once the PR is merged. The new documentation file does not contain this URL.

2. 500 on https://prow.ci.openshift.org/job-history/gs/origin-ci-test/logs/openshift-release-master-config-bootstrapper — This is a pre-existing failure from ./public/internals/configuration-updates/index.html, unrelated to this PR.

Neither failure is actionable for this PR.

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AI-generated. Review for accuracy.