OADP-8080: Comparison doc for cli oadp-1.5 vs oadp-1.6

[NicholasYancey]

Why the changes were made

The oadp-1.5 branch is a dependency backport from oadp-1.6 (Velero 1.16, controller-runtime 0.19.3, version strings, etc.). There was no branch-specific documentation explaining:

• What the branch is for (OCP 4.19–4.21 / OADP 1.5)
• How it differs from oadp-1.6 (code, dependencies, CLI vs platform behavior)
• How to build, test, and maintain the branch
  This PR adds docs/OADP-1.5.md and links it from README.md under Release branches.

How to test the changes made

Doc-only change; no code or dependency updates.

Jira Link

https://redhat.atlassian.net/browse/OADP-8080

[openshift-ci-robot]

@NicholasYancey: This pull request references OADP-8080 which is a valid jira issue.

Details

In response to this:

Why the changes were made

The oadp-1.5 branch is a dependency backport from oadp-1.6 (Velero 1.16, controller-runtime 0.19.3, version strings, etc.). There was no branch-specific documentation explaining:

• What the branch is for (OCP 4.19–4.21 / OADP 1.5)
• How it differs from oadp-1.6 (code, dependencies, CLI vs platform behavior)
• How to build, test, and maintain the branch
  This PR adds docs/OADP-1.5.md and links it from README.md under Release branches.

How to test the changes made

Doc-only change; no code or dependency updates.

Jira Link

https://redhat.atlassian.net/browse/OADP-8080

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: NicholasYancey
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[Joeavaikath]

Was curious: do we have something similar on 1.6 and oadp-dev?
We might not need it since this is a one time thing back porting and adding new release branches