⚙️ Add tests for TargetsHasher

[swiftyfinch]

Description

I've added tests for TargetsHasher.

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: 3 lines in your changes are missing coverage. Please review.

Comparison is base (c2646bd) 41.09% compared to head (4c2fcd6) 42.84%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...ndation/Core/Common/Hashers/BuildRulesHasher.swift	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #299      +/-   ##
==========================================
+ Coverage   41.09%   42.84%   +1.75%     
==========================================
  Files         142      142              
  Lines        4171     4166       -5     
==========================================
+ Hits         1714     1785      +71     
+ Misses       2457     2381      -76     

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