Rename Dockerfile

[ashwindasr]

Refactor name to Dockerfile.ocp as a better, version independent, alternative since contents are actually rhel9.

CI: openshift/release#54072 (probably needs to merge first)

Please follow up with other changes in this/other repos if necessary. ART has setup the necessary fallbacks, but only for 4.17, if backporting this PR, please give us a heads up.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ashwindasr
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[ingvagabund]

/retest-required

[openshift-ci]

@ashwindasr: 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/verify	42856f0	link	true	/test verify

Full PR test history. Your PR dashboard.

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