fix: Exclude replaced documents from IESG discusses

[pselkirk]

Fixes #7179

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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]

This is good (though it could be simplified to chain the exclude onto the existing statement, and the whole statement could benefit from being processed by black.)

But there should be a test that proves it. I suspect it will be a small adjustment to an existing test.

[rjsparks]

OBE by #7712