Refactor and add connect all client

[nwnt]

Fix #20052

This also contains quite extensive refactoring for simulateTraffic.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.74%. Comparing base (fb7e3f2) to head (500642c).
Report is 5 commits behind head on main.

Additional details and impacted files

see 157 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20173      +/-   ##
==========================================
- Coverage   69.09%   62.74%   -6.35%     
==========================================
  Files         410      401       -9     
  Lines       34232    33295     -937     
==========================================
- Hits        23653    20892    -2761     
- Misses       9165    10851    +1686     
- Partials     1414     1552     +138     

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