[CI]: Mark stale and close issues after inactivity

[synchon]

• description of feature/fix
• tests added/passed
• add an entry for the latest changes

This PR adds a GitHub Actions workflow which marks issues as stale and later on closes them if they have the label question (meaning waiting for a response) and they were not replied in 30 days (stale) and then closes (7 more days) them.

[github-actions]

PR Preview Action v1.6.2
Preview removed because the pull request was closed.
2025-09-16 20:30 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.67%. Comparing base (c85d142) to head (64aa6a0).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #464   +/-   ##
=======================================
  Coverage   91.67%   91.67%           
=======================================
  Files         146      146           
  Lines        6019     6019           
  Branches      962      962           
=======================================
  Hits         5518     5518           
  Misses        324      324           
  Partials      177      177           

Flag	Coverage Δ
junifer	91.67% <ø> (ø)

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