Comparison doc for cli oadp-1.4 vs oadp-1.5

[NicholasYancey]

Why the changes were made

The oadp-1.4 downport branch is merged, but there was no developer guide for that release line. This adds documentation matching the pattern from #199 such as OCP/OADP mapping, dependency comparison vs oadp-1.5, build/test workflow, related repos, and downstream delivery steps still needed for 1.4.

How to test the changes made

Doc-only change; no code or dependency updates.

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