[gdal-dev] Adding a CI "stale" workflow for pull requests without activity

[Even Rouault]

Hi,

I'm proposing in https://github.com/OSGeo/gdal/pull/9693 that we add a 
CI "stale" workflow for pull requests without activity. It is mostly a 
copy&paste from QGIS similar workflow with the following changes:
- restrict the scope to pull requests only and not tickets (although we 
could potentially also do that for tickets that are in the "awaiting 
feedback" state)
- increase the period to tag a pull request as "stale" to 28 days 
without activity. The stale bot adds a message in the PR explaining 
that, and that they have an extra delay of 14 days to make it progress, 
otherwise it will be automatically closed. So basically a PR without 
activity for 6 weeks will be automatically closed. I think this is a 
fair delay.

The rationale for that is that it makes the cognitive load of PR 
reviewers lower by avoiding to have to read repeatedly a list of stale 
PRs, and it also encourages contributors to either make their work 
progress towards completion (or just make them realize that they don't 
have the bandwidth or motivation to make it further progress, which is 
also fine).

Even

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