fix: Exclude replaced documents from IESG discusses

[pselkirk]

Fixes #7179

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.84%. Comparing base (187c2c5) to head (421994f). Report is 79 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7258      +/-   ##
==========================================
- Coverage   88.98%   88.84%   -0.15%     
==========================================
  Files         291      291              
  Lines       40717    41102     +385     
==========================================
+ Hits        36233    36516     +283     
- Misses       4484     4586     +102     

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[rjsparks]

OBE by #7712