RFR: 2042: Allow bulk requests with /approval request command [v3]

[Zhao Song]

On Fri, 29 Sep 2023 16:36:08 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> As some users requested, we will allow bulk requests with `/approval` request command.
>> 
>> If an id is not specified in the `/approval` command, the bot will generate a maintainer approval request for all associated bugs.
>> 
>> This also applies to the `/approval cancel` command, which will cancel the maintainer approval request for all associated bugs.
>
> Zhao Song has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review comment

Thanks for the review!

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PR Comment: https://git.openjdk.org/skara/pull/1565#issuecomment-1741246186