[Frontend] Improve readability of conditional passes

[erick-xanadu]

Context: We are using the term pipeline a lot. We are also defining compilation pipelines at the module level and modifying them depending on configuration options.

Description of the Change: Change the compilation pipeline into stages and improve readability of passes that are conditional on compile time options.

Benefits: Readability.

[codecov]

Codecov Report

Attention: Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.95%. Comparing base (75dc517) to head (f6b28ee).

Files with missing lines	Patch %	Lines
frontend/catalyst/debug/compiler_functions.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1194      +/-   ##
==========================================
+ Coverage   96.72%   97.95%   +1.23%     
==========================================
  Files          56       77      +21     
  Lines        6800    11331    +4531     
  Branches      780      978     +198     
==========================================
+ Hits         6577    11099    +4522     
- Misses        173      182       +9     
  Partials       50       50              

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[paul0403]

🥳 Thanks! Apart from readability I like how these lists are no longer just globals floating around.

Is it possible to increase some test coverage to address codecov?

[erick-xanadu]

Is it possible to increase some test coverage to address codecov?

I am a bit opposed to creating unit tests for these functions. They are so simple and it would just make us recreate the list in the tests. This would mean having to modify tests whenever we change the list of passes to run.