Add filecheck tests for xDSL cancel_inverses and merge_rotations passes

[mudit2812]

[sc-92245]

• Add lit tests for IterativeCancelInversesPass and MergeRotationsPass.
• Add run_filecheck fixture to make it easier to use the filecheck utility.
• Fix issues found with both passes when dealing with controlled gates during testing.

Blocked by #7590 as I would like to update the tests to use the custom assembly format of CustomOp instead of the generic syntax.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.68%. Comparing base (a4a14be) to head (4a7f224).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7595   +/-   ##
=======================================
  Coverage   99.68%   99.68%           
=======================================
  Files         531      531           
  Lines       51896    51896           
=======================================
  Hits        51732    51732           
  Misses        164      164           

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[erick-xanadu]

Whenever you merge this, can you do me a solid and erase this line? 60cf928#diff-51b5c9761bc1138cebc4b7183e5f41a7d67d42f7833e5be5072d332681cc2558R140

In case the link doesn't work, there's an extra print on line 140

[mudit2812]

Whenever you merge this, can you do me a solid and erase this line? 60cf928#diff-51b5c9761bc1138cebc4b7183e5f41a7d67d42f7833e5be5072d332681cc2558R140

In case the link doesn't work, there's an extra print on line 140

@erick-xanadu done in 5852fe2

[PietropaoloFrisoni]

Thanks, looks good. I can use the same style for the tests on decompositions 👍

Shouldn't the MergeRotationsPass be called IterativeMergeRotationsPass as well?