🏎️ Speed up the process of deleting sources

[swiftyfinch]

Description

• I've sped up deleting sources in the multi-proj configuration up to 10x
• I've fixed the help output width
• I've implemented an ability to add warmup headers in the cache command

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: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 64.32%. Comparing base (130401d) to head (3b3ec0e).

Files	Patch %	Lines
...ion/XcodeProject/Services/XcodeTargetsEditor.swift	0.00%	3 Missing ⚠️
Sources/Rugby/Core/Help/HelpPrinter.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #372      +/-   ##
==========================================
- Coverage   64.34%   64.32%   -0.02%     
==========================================
  Files         146      146              
  Lines        3733     3734       +1     
==========================================
  Hits         2402     2402              
- Misses       1331     1332       +1     

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