feature: add stale exempt label

[TerryHowe]

Add stale exempt label

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 87.33%. Comparing base (6c3e3e5) to head (8684caf).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1886      +/-   ##
==========================================
+ Coverage   87.29%   87.33%   +0.03%     
==========================================
  Files         143      143              
  Lines        5535     5535              
==========================================
+ Hits         4832     4834       +2     
+ Misses        417      415       -2     
  Partials      286      286              

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