This commit updates the close-issue CI job to not automatically close
issues. It also adds a stale lable message that explains why the issue
was marked as stale.
The motivation for this is that we enabled this job recently and there
have been a few comments from users/reporters that they did not get any
notification or motivation for closing. Hopefully marking the issues as
stale will give a notification the the reporters and we can manually
look through stale issues.
Refs: https://github.com/ggml-org/whisper.cpp/issues/586#issuecomment-5579674875
This commit moves the close-issue.yml file to the .github/workflows/
directory.
The motivation for this is that it is currently in the root of the repo
and is not currently active. Moving it to the workflows directory will
make it active and allow it to run.