User Story:

As a downstream consumer of the installer (as a library), I want to be able to:

• Choose whether or not the image gallery is used when creating machinesets on Azure

so that I can achieve

• Backwards compatibility with pre-4.12

Engineering Details:

• https://github.com/openshift/installer/pull/6737
• Note that this work has already been completed and the PR has merged.  I am creating this ticket in order to facilitate the cherry-pick of this commit to 4.12  per instructions given here: https://redhat-internal.slack.com/archives/C68TNFWA2/p1673468007678679