adds io.openshift.os.streamclass to OKD OS and extensions images

[cheesesashimi]

To support a singular OS Stream in OKD, we need to add a label to the SCOS 10 image (io.openshift.os.streamclass). For RHCOS 10, this label is set within the build-node-image.Jenkinsfile. Since the value of this label depends on whether it is an RHCOS 9 or RHCOS 10 image, the value must be set at build-time instead of via the Containerfile. Since OKD will only have one OS Stream (scos-10), we could set it statically in the Containerfile(s) found in http://github.com/openshift/os. However, I think it makes more sense to do it at build-time until there is a better way of setting it dynamically.

With the above in mind, this PR accomplishes that by modifying the image targets to be the input for an inline Containerfile which sets this label.

[openshift-ci]

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[REHEARSALNOTIFIER]
@cheesesashimi: the pj-rehearse plugin accommodates running rehearsal tests for the changes in this PR. Expand 'Interacting with pj-rehearse' for usage details. The following rehearsable tests have been affected by this change:

Test name	Repo	Type	Reason
pull-ci-openshift-os-master-okd-scos-e2e-aws-ovn	openshift/os	presubmit	Ci-operator config changed
pull-ci-openshift-os-master-okd-scos-images	openshift/os	presubmit	Ci-operator config changed

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[cheesesashimi]

/pj-rehearse pull-ci-openshift-os-master-okd-scos-images

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[dustymabe]

The code in the PR seems reasonable. The actual string suggested here may be able to be improved. For rhcos 9 and rhcos 10 the string we are using for the stream class is rhel-9 and rhel-10. I'm not sure if we want scos-10 here or centos-10.