chore: Add stale issues workflow

[just-boris]

Description

Add workflow to auto-close issues

Related links, issue #, if available: n/a

How has this been tested?

n/a

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.30%. Comparing base (f54be82) to head (4c23e34).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #127   +/-   ##
=======================================
  Coverage   99.30%   99.30%           
=======================================
  Files          29       29           
  Lines         717      717           
  Branches      195      195           
=======================================
  Hits          712      712           
  Misses          5        5           

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