okd-scos: fix etcd job and add installer-etcd-artifact image

[Prashanth684]

In an effort to build OKD on top of centos stream(https://issues.redhat.com/browse/OKD-210), OKD-scos configs were added in #50118. We are going through all images and identifying the ones which do not build and are working to fix them. This PR mimics the changes in the other configuration files and also adds the artifact image building.

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@Prashanth684: 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-etcd-openshift-4.16-okd-scos-images	openshift/etcd	presubmit	Ci-operator config changed

Prior to this PR being merged, you will need to either run and acknowledge or opt to skip these rehearsals.

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[Prashanth684]

/pj-rehearse pull-ci-openshift-etcd-openshift-4.16-okd-scos-images

[openshift-ci-robot]

@Prashanth684: now processing your pj-rehearse request. Please allow up to 10 minutes for jobs to trigger or cancel.

[Prashanth684]

@jupierce etcd uses Dockerfile.rhel in its other jobs.. should ocp-build-data be updated?

[hasbro17]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hasbro17, Prashanth684

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[Prashanth684]

/pj-rehearse ack

[openshift-ci-robot]

@Prashanth684: now processing your pj-rehearse request. Please allow up to 10 minutes for jobs to trigger or cancel.

[openshift-ci]

@Prashanth684: all tests passed!

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