fix(commit): trim the trailing newline for git2 commits

[orhun]

Description

Now we remove the trailing newline for every commit retrieved from a repository.

Motivation and Context

closes #745

How Has This Been Tested?

cargo test

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.33%. Comparing base (82cc09f) to head (42a48f6).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #872   +/-   ##
=======================================
  Coverage   40.33%   40.33%           
=======================================
  Files          21       21           
  Lines        1664     1664           
=======================================
  Hits          671      671           
  Misses        993      993           

Flag	Coverage Δ
unit-tests	40.33% <100.00%> (ø)

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