Add deploy-sno-reconfig-ipv6 test job for jetlag

[mcornea]

Summary

Add a test job that verifies the assisted-service pod properly picks up configuration changes when redeploying on the same bastion. The job:

1. Deploys SNO with standard IPv4 configuration
2. Reconfigures all.yml for single-stack IPv6 with use_bastion_registry: true
3. Re-runs setup-bastion.yml + sno-deploy.yml without cleaning up containers
4. Verifies the IPv6 deployment succeeds (assisted-service pod picks up new config)

This tests the fix in redhat-performance/jetlag#787.

Changes

• ref YAML: Add REDEPLOY_IPV6 env var (default false)
• commands script: After initial deploy, if REDEPLOY_IPV6=true, append IPv6 network config + setup_bastion_registry: true + use_bastion_registry: true to all.yml and redeploy without clean-resources.sh
• test config: Add deploy-sno-reconfig-ipv6 test entry with JETLAG_PR: "787"

After jetlag PR merges

Remove JETLAG_PR: "787" from the test entry and keep the job as a permanent regression test.

Test plan

• /test deploy-sno-reconfig-ipv6 — verifies the full IPv4→IPv6 reconfig path

[openshift-ci]

PR needs rebase.

Details

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mcornea
Once this PR has been reviewed and has the lgtm label, please assign mtulio, neisw 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/openshift/release/OWNERS
• ci-operator/config/redhat-openshift-ecosystem/opct/OWNERS
• ci-operator/config/redhat-performance/jetlag/OWNERS [mcornea]
• ci-operator/jobs/openshift/release/OWNERS
• ci-operator/jobs/redhat-openshift-ecosystem/opct/OWNERS
• ci-operator/step-registry/openshift-qe/OWNERS [mcornea]

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[openshift-ci-robot]

[REHEARSALNOTIFIER]
@mcornea: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.