RFR: 1495: /backport should be allowed in PRs which have been integrated [v2]

[Guoxiong Li]

On Thu, 28 Jul 2022 20:41:36 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> please align the reply with the one in PullRequestCommandWorkItem

Fixed.

> Also, if that's the case, please change the bug and PR title to make this clear. That's the main feature being added here.

I revised the title just now.

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