⚙️ Add tests for BuildPhaseHasher

[swiftyfinch]

Description

I've added tests for BuildPhaseHasher.

References

• #236

Checklist (I have ...)

• 🧐 Followed the code style of the rest of the project
• 📖 Updated the documentation, if necessary
• 👨🏻‍🔧 Added at least one test which validates that my change is working, if appropriate
• 👮🏻‍♂️ Run make lint and fixed all warnings
• ✅ Run make test and fixed all tests

❤️ Thanks for contributing to the 🏈 Rugby!

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (28b32b6) 37.30% compared to head (ea3d7db) 39.54%.

Files	Patch %	Lines
...ndation/Core/Common/Hashers/BuildRulesHasher.swift	0.00%	1 Missing ⚠️
...n/Core/Common/Hashers/CocoaPodsScriptsHasher.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #294      +/-   ##
==========================================
+ Coverage   37.30%   39.54%   +2.23%     
==========================================
  Files         142      142              
  Lines        4176     4175       -1     
==========================================
+ Hits         1558     1651      +93     
+ Misses       2618     2524      -94     

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