Cherry-pick: Fix CLI version in Konflux builds

[Joeavaikath]

Summary

Cherry-pick of #184 and #186 to oadp-1.6.

• Renames VERSION to OADP_VERSION in Containerfile.download to avoid collision with Konflux-injected VERSION (Go toolchain version)
• Uses ART-injected BUILD_VERSION and SOURCE_GIT_COMMIT env vars in konflux.Dockerfile for correct version info
• Fixes oc oadp version reporting Version: 1.25 (Go version) instead of the actual OADP version

Test plan

• Verify next Konflux build produces binary with Version: 1.6.0
• Verify Git commit shows the correct SHA

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[kaovilai]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Joeavaikath, kaovilai, shubham-pampattiwar

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