RFR: 2141: Inform user about accepting fork repo invite in /backport command reply [v2]

[Erik Joelsson]

On Thu, 11 Jan 2024 23:13:41 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> After users issued /backport command to create backport PRs in GitHub, skara bot will invite the users to be collaborators of the bot's fork. Sometimes, the users will ignore the invitation and later when they are trying to update the backport branch, they will find they don't have the access. This patch is trying to add a comment to remind the user to accept the invitation.
>
> Zhao Song has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - update
>  - only send the reminder when user doesn't have the push access

Marked as reviewed by erikj (Lead).

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PR Review: https://git.openjdk.org/skara/pull/1598#pullrequestreview-1817074285