[ART-9923] support dockerfile_fallback field

[ashwindasr]

Alongside openshift-eng/ocp-build-data#5002

Upstream Dockerfiles are sometimes incorrectly named as .rhel7 or .rhel8 when their actual contents are rhel9. Added a new dockerfile_fallback field in ocp-build-data, so that we can raise upstream PRs without the need for coordinating the PR merge with ocp-build-data

Changes in this PR:

• Refactor the logic to find the dockerfile name to resolve_dockerfile_name in doozer utils.py
• Use that function in rebase and upstream pr logic so that we consistently give back the same name

[openshift-ci]

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[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/security	7cfb9d8	link	false	/test security

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[joepvd]

/lgtm
/approve
setting:
/hold
please unhold at will

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: joepvd

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[ashwindasr]

test build succeeded, not breaking existing functionality

[ashwindasr]

/unhold