Remove busybox container from tests

[jiripetrlik]

It seems that busybox container is no longer needed.

[sutaakar]

/lgtm

[openshift-ci]

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[openshift-ci]

@jiripetrlik: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-odh-dw	e12cba4	link	true	/test e2e-odh-dw

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[dimakis]

have we tested this?

[jiripetrlik]

I've run TestRayJobSubmissionRest locally. Also PR check seems to fail only on MCAD jobs and MCAD jobs are expected to fail am I right @sutaakar ?

[sutaakar]

Right, merging