[#74] Replaced custom git commands.

[tannguyen04]

Checklist before requesting a review

closes #64

• I have formatted the subject to include ticket number as [#123] Verb in past tense with dot at the end.
• I have added a link to the issue tracker
• I have provided information in Changed section about WHY something was done if this was not a normal implementation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have run new and existing relevant tests locally with my changes, and they passed
• I have provided screenshots, where applicable

Changed

Screenshots

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 41.71779% with 95 lines in your changes are missing coverage. Please review.

Project coverage is 22.87%. Comparing base (a0e5cc4) to head (bbef9c5).

Files	Patch %	Lines
src/Artifact.php	0.00%	91 Missing ⚠️
src/Commands/ArtifactCommand.php	0.00%	2 Missing ⚠️
src/FilesystemTrait.php	0.00%	1 Missing ⚠️
src/GitArtifactGitRepository.php	98.52%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #78       +/-   ##
==========================================
+ Coverage   6.50%   22.87%   +16.36%     
==========================================
  Files          5        7        +2     
  Lines        461      529       +68     
==========================================
+ Hits          30      121       +91     
+ Misses       431      408       -23     

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[AlexSkrypnyk]

@tannguyen04
Please see my inline comments.

[AlexSkrypnyk]

@tannguyen04
This is so much cleaner! Great stuff.