🐛 Bug Report

How To Reproduce

Steps to reproduce the behaviour:

1. The stale GitHub action suggests to mention @SciTools/iris-devs to have a stale issue re-opened, however we have learned a mention can only be done by someone already in the GitHub team.

Expected behaviour

The stale comments should state a way that works.

Environment

N/A

Additional context

A GitHub action (GHA) could be created to look for specific text such as /not stale or ping @Scitools/iris-devs on a new issue comment that will then add a comment itself and mention the team, I think the GHA will have permission to do this (needs testing).

conda-forge does something similar as per the comment in #4617.

Alternatively a GHA could be triggered to just reopen the issue, similar to the above but triggred by /reopen.