chore: generalize contract class from file test util

[ArniStarkware]

This change is 

[ArniStarkware]

• feat: add compile sierra to casm util #493
• chore: set empty relative_path #495
• chore: generalize contract class from file test util #494 👈
• main

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.38%. Comparing base (3d98805) to head (da33b52).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #494   +/-   ##
=======================================
  Coverage   83.38%   83.38%           
=======================================
  Files          37       37           
  Lines        1776     1776           
  Branches     1776     1776           
=======================================
  Hits         1481     1481           
  Misses        218      218           
  Partials       77       77           

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[Yael-Starkware]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ArniStarkware)