add TEST_COMMAND parameter to installer-e2e template

[sallyom]

@stevekuznetsov this was missed here: 708252c

getting an error in e2e-aws job, I think this should fix it

[openshift-ci-robot]

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[openshift-ci-robot]

@sallyom: Updated the prow-job-cluster-launch-installer-e2e configmap using the following files:

• key cluster-launch-installer-e2e.yaml using file ci-operator/templates/cluster-launch-installer-e2e.yaml

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In response to this:

@stevekuznetsov this was missed here: 708252c

getting an error in e2e-aws job, I think this should fix it

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