RFR: 2083: Add option for omitting messages about /approval command

[Zhao Song]

On Wed, 1 Nov 2023 16:50:56 GMT, Zhao Song <zsong at openjdk.org> wrote:

> We don't need to notify users about the /approval command in all cases. So we should make it optional.
> 
> Also the term "maintainer approval" may confuse users in some cases and we also need to make it configurable.

Thanks for the review!

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PR Comment: https://git.openjdk.org/skara/pull/1580#issuecomment-1789762672