RFR: 2070: Get a placeholder message spot for integration message

[Magnus Ihse Bursie]

On Fri, 8 Mar 2024 23:48:04 GMT, Zhao Song <zsong at openjdk.org> wrote:

> As Magnus said in the issue description, sometimes it's hard for users to find the merge ready comment. So he would like to see that this message is added as soon as possible, after the bridgekeeper has done its job. 
> 
> In this patch, on the very beginning of CheckWorkItem, skara bot would post a placeholder message to the PR and update it later.

Nice! Thanks for fixing this. Do you have an test PR that demonstrates how this looks?

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PR Comment: https://git.openjdk.org/skara/pull/1619#issuecomment-1988374215