Delete from dev-preview mirror more precisly

[joepvd]

No description provided.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@joepvd: 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/security	6cf1b86	link	false	/test security

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[joepvd]

/hold
this is wrong