Operator deployed with non-olm manifests assumes wrong default images

By default such an operator would assume the registry.gitlab.com/gitlab-org/gitlab-runner:alpine-bleeding and registry.gitlab.com/gitlab-org/gitlab-runner-helper:alpine-bleeding images.

It does that because these manfiests are not built with related images. We should try to get a correct image to be used.

Also these images will fail by default since they are not root-enabled and that the runAsNonRoot property is set by the Operator Manager.

The UBI images should be used instead.