feat: Improve rendering of tags and cases

[aborgna-q]

Some minor changes to clean up the python rendering:

• Add more special cases when rendering a Tag operation:

  • Bool tags are shown as False or True (We used Left and Some before)
  • Added a None case (It was shown as Left before)

• Print the case number inside conditionals

• drive-by: Add missing pytest-xdist dev dependency. It is used to pass -n auto to pytest in some just tasks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.81%. Comparing base (86b654b) to head (acddcfc).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2943   +/-   ##
=======================================
  Coverage   83.81%   83.81%           
=======================================
  Files         267      267           
  Lines       53053    53061    +8     
  Branches    46992    46992           
=======================================
+ Hits        44465    44473    +8     
  Misses       6318     6318           
  Partials     2270     2270           

Flag	Coverage Δ
python	88.76% <100.00%> (+0.01%)	⬆️

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