Modify project management workflow settings

[osAplet]

Updated project management workflow configuration and modified the unassignment criteria for stale issues.

What kind of changes does this PR include?

• [ ] Fixes or refactors
• [ ] A new challenge
• [ ] Additional documentation
• [ ] Something else

Description

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References

Checklist:

• [ ] All the contributions made are solely the work of me and my co-authors
• [ ] I used AI to generate parts of the content.
• [ ] I tested the changes in this PR (if applicable)
• [ ] I added unit tests to ensure my change works (when change in Java or on front-end code)
• [ ] I added UI tests to ensure my UI changes work (when change in the overall UI, not needed if just adding a challenge)
• [ ] The PR passes pre-commit hooks and automated tests