RFR: 1495: /backport on PRs instead of commits should inform of proper usage [v2]

Thu Jul 28 20:18:18 UTC 2022

On Thu, 28 Jul 2022 18:54:00 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Additional information: When the PR has been integrated and the `backport` command is used in this integrated PR, the another `handle` method  instead of this method will be invoked so that the `backport` command can be processed.
>
> But BackportCommand doesn't yet support running on a PR. That's still a feature that would need to be implemented.

In this patch, it can be used at PRs which had been integrated. This is a main feature of this patch.

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PR: https://git.openjdk.org/skara/pull/1341