Add Containerfile.art, art.yaml, and image-references for ART builds

[shruti-rh]

Problem Statement

ART needs to build cert-manager-operator images through its Konflux-based layered products pipeline. ART builds require a dedicated Containerfile.art with ART's builder images, base images, and LABEL conventions.

Related Issue

Part of ART-14816 (Onboard OAP operators to ART).

Proposed Changes

Add Containerfile.art adapted from cert-manager-operator-release release-1.19 for ART build pipeline (COPY . . instead of submodule, ART builder images and labels).

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: shruti-rh
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[openshift-ci]

Hi @shruti-rh. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

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