[CI] Fix stale issue workflow

[peterargue]

This has been failing since it was moved to the workflows directory. Update the format to use standard GHA job, and run daily.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.51%. Comparing base (957437f) to head (ecaa5cd).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5873      +/-   ##
==========================================
+ Coverage   55.49%   55.51%   +0.02%     
==========================================
  Files        1133     1133              
  Lines       89496    89496              
==========================================
+ Hits        49662    49680      +18     
+ Misses      35062    35045      -17     
+ Partials     4772     4771       -1     

Flag	Coverage Δ
unittests	55.51% <ø> (+0.02%)	⬆️

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