tests: Add test for xdsl_opt passes

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[codecov]

Codecov Report

Base: 90.95% // Head: 91.05% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (a92f01d) compared to base (66fd1c8).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
+ Coverage   90.95%   91.05%   +0.09%     
==========================================
  Files          50       50              
  Lines        7064     7084      +20     
  Branches     1167     1168       +1     
==========================================
+ Hits         6425     6450      +25     
+ Misses        396      391       -5     
  Partials      243      243              

Impacted Files	Coverage Δ
tests/xdsl_opt/test_xdsl_opt.py	100.00% <100.00%> (ø)
xdsl/xdsl_opt_main.py	88.43% <100.00%> (+3.14%)	⬆️

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