RFR: 1563: The method 'CheckRun#updateMergeReadyComment' shouldn't update the comment if the comment has not changed

[Zhao Song]

On Fri, 30 Sep 2022 11:01:42 GMT, Guoxiong Li <gli at openjdk.org> wrote:

> The logs should reflect that the existing comment is not equal to the new comment. Because we may change the content of the `no longer ready comment` or the `merge ready comment` in the future. Then the `pr.updateComment` is invoked, but it is not because of `Updating merge ready comment as no longer ready`.

Got it! Thanks!

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PR: https://git.openjdk.org/skara/pull/1386