[ossm]: Add Istio testing image to Image mirroring config

[cam-garrison]

No description provided.

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@cam-garrison: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.

[openshift-ci]

@cam-garrison: all tests passed!

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[danilo-gemoli]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cam-garrison, danilo-gemoli, FilipB, Prucek

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