RFR: 1997: Allow the creator of a PR to set the commit author [v3]

[Zhao Song]

On Fri, 1 Sep 2023 21:30:52 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Sure, will reuse the comments
>
> Was there a reason you didn't add the comments as a field in `CheckablePullRequest`? I think that would make more sense as the `PullRequest` already is a field.

No. I misunderstood what you mean in the morning. I will fix it soon.

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PR Review Comment: https://git.openjdk.org/skara/pull/1553#discussion_r1313568664