Add helper script to change the deployed MCO image

[douglascamata]

Description of the change:

Added a small shell script to automate changing the MCO image deployed in a cluster through the CSV resource.

Motivation for the change:

Manual work that has many steps which can have mistakes or be forgotten.

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[coleenquadros]

@douglascamata this might not work from ACM 2.9 onwards. We now change the MCO image via a configmap - https://github.com/stolostron/multiclusterhub-operator#add-image-overrides-via-configmap Context https://redhat-internal.slack.com/archives/CUEMEHRA9/p1697051515351129

[douglascamata]

@coleenquadros ack. Will take a look at this when I have some time.