ci-operator/openshift/os: Remove 8.6 references

[travier]

Remove RHEL 8.6 references and use unversioned names for images until we
have figured out how we will support RHCOS 9.

See:

• build rhcos extensions image nightly #30351
• ci: Remove version selection script os#882

[cgwalters]

Yes, I agree with having unversioned images for now.

But, it won't be long before we do need to do versioning. The current proposals call for e.g. rhel-coreos-8 in the release image (but not rhel-coreos-8-6).

[cgwalters]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cgwalters, travier

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[openshift-ci]

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[openshift-ci]

@travier: Updated the following 3 configmaps:

• ci-operator-master-configs configmap in namespace ci at cluster app.ci using the following files:
  • key openshift-os-master__periodic.yaml using file ci-operator/config/openshift/os/openshift-os-master__periodic.yaml
• job-config-master-postsubmits configmap in namespace ci at cluster app.ci using the following files:
  • key openshift-os-master-postsubmits.yaml using file ci-operator/jobs/openshift/os/openshift-os-master-postsubmits.yaml
• job-config-master-presubmits configmap in namespace ci at cluster app.ci using the following files:
  • key openshift-os-master-presubmits.yaml using file ci-operator/jobs/openshift/os/openshift-os-master-presubmits.yaml

In response to this:

Remove RHEL 8.6 references and use unversioned names for images until we
have figured out how we will support RHCOS 9.

See:

• build rhcos extensions image nightly #30351
• ci: Remove version selection script os#882

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.