Update HorizonTest image name variable

[kstrenkova]

The variable RELATE_IMAGE_HORIZONTEST was not consistent with other resource types that also have TEST_ infix. This change makes it consistent not only for HorizonTest and fixed a small bug, but also with other resource types.

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This pull-request has been approved by: adrianfusco, kstrenkova

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Build succeeded (check pipeline).
https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/f3d175104cbf489e9ab94c26d90ab5c4

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