RFR: 1814: Add logic to allow bot run Backport Command

Wed Feb 8 23:29:46 UTC 2023

On Wed, 8 Feb 2023 22:48:50 GMT, Zhao Song <zsong at openjdk.org> wrote:

> In [SKARA-1797](https://bugs.openjdk.org/browse/SKARA-1797), the bot might issue /backport command when the pr is integrated. 
> 
> However, in the very first of Backport Command, the bot would check whether the command user is in the census. The bot itself is not in the census, so the command issued by the bot would fail.
> 
> In this patch, I added the logic to explicitly allow bot run `/backport` command in closed pr or commits.

Marked as reviewed by erikj (Lead).

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PR: https://git.openjdk.org/skara/pull/1468