[wbarnha]

Summary

• Keep Faust's partition assignor enabled whenever exactly-once transactions are active, even with zero standby replicas and no changelog tables.
• Add regression coverage for transaction mode while preserving the round-robin path for ordinary workers.

Fixes #440.

Validation

• Focused aiokafka assignor tests: 3 passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.20%. Comparing base (3442a90) to head (3c28b55).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #798   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files         110      110           
  Lines       11791    11791           
  Branches     1282     1282           
=======================================
  Hits        11343    11343           
  Misses        351      351           
  Partials       97       97           

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