Changes

 [GitHub] Add a python-based action managing discussions  (#4268)

* [GitHub] Add a python-based action managing discussions

* add python script

* make action triggered on labels

* simplify action

* add python-graphql-client dependency

* add dateutil dependency

* activate script limited on 1 topic per activation and remove cron temporarily

* add verbosity on discussions, add cron & dispatch trigger, remove trigger on label changes

* Rename action as: Stale GitHub Discussions

* Apply suggestions from code review

Co-authored-by: Alex Bilger <alxbilger@users.noreply.github.com>

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Co-authored-by: Alex Bilger <alxbilger@users.noreply.github.com>