fix(git): force the default git locale on methods relying on parsing the output

[noirbizarre]

Description

This change ensure that methods relying on localized git output parsing use the default locale instead of the one defined by the user.

Currently, there was only on, git.get_tags() when no commit exists. This PR ensure the command is run with the default C locale (meaning no locale). Currently, it was failing to handle this case on non-english system and producing 2 test failures on non-english system.

Checklist

• Add test cases to all the changes you introduce
• Run ./scripts/format and ./scripts/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes (N/A)

Expected behavior

Command output parsing works whatever the user locale.
Test runs and succeed whatever the user locale.

Steps to Test This Pull Request

Define your environment locale (LANG/LANGUAGE/LC_ALL depending on the OS, shell ...) to anything else than en_* locale or C locale and then:

• run the test suite: it should succeed
• run the cz changelog command on a repository without commits: it should succeed

Additional context

I choose to set the environment variables only on the command relying on localized output parsing. Benefit: any other call is localized and user can read potential failures in its own language. Drawback: devs should think about localization and forcing locale each time they want to parse a localized output.

Potential alternatives:

• force all command to run in their default language
• force all git calls to run in git default locale

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.45%. Comparing base (120d514) to head (8759a73).
Report is 205 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1012      +/-   ##
==========================================
+ Coverage   97.33%   97.45%   +0.11%     
==========================================
  Files          42       55      +13     
  Lines        2104     2395     +291     
==========================================
+ Hits         2048     2334     +286     
- Misses         56       61       +5     

Flag	Coverage Δ
unittests	97.45% <100.00%> (+0.11%)	⬆️

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