Add a workflow action to mark and autoclose stale issues

[levan-m]

What does this PR do?

Issues without any of these labels no stale,enhancement,feature request,bug,feature/datadog-monitor,feature/slo which haven't been for 1 year will be marked as stale and autoclosed after 14 days (workflow run every Monday) unless there is a user activity.

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.26%. Comparing base (1c66029) to head (ebcab79).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1315      +/-   ##
==========================================
+ Coverage   55.20%   55.26%   +0.05%     
==========================================
  Files         247      247              
  Lines       28383    28649     +266     
==========================================
+ Hits        15670    15833     +163     
- Misses      11827    11928     +101     
- Partials      886      888       +2     

Flag	Coverage Δ
unittests	55.26% <ø> (+0.05%)	⬆️

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see 9 files with indirect coverage changes

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