interpreter: (ematch) Add run_union

[jumerckx]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 72.22222% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.33%. Comparing base (6fbde48) to head (ab79e87).

Files with missing lines	Patch %	Lines
xdsl/interpreters/ematch.py	72.22%	16 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5708      +/-   ##
==========================================
- Coverage   86.35%   86.33%   -0.02%     
==========================================
  Files         406      406              
  Lines       57774    57845      +71     
  Branches     6713     6730      +17     
==========================================
+ Hits        49888    49941      +53     
- Misses       6326     6341      +15     
- Partials     1560     1563       +3     

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