RFR: 1818: Get rid of extra REST request in GitLabMergeRequest#author

Mon Feb 13 22:45:50 UTC 2023

On Mon, 13 Feb 2023 21:01:06 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Currently, in GitLabMergeRequest#author, the bot makes an unnecessary REST request to retrieve the HostUser object. 
> However, with recent advancements in GitLab, it's possible to parse the HostUser directly from the pull request JSON. 
> Getting rid of this redundant REST request would also solve the 'user is inactive' issue.

Marked as reviewed by erikj (Lead).

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PR: https://git.openjdk.org/skara/pull/1471