Refacto: add a Git handler base class to inherit from and avoid duplicate code

[Guts]

• add a class GitHandlerBase and make LocalGitHandler and RemoteGitHandler inherit from to mutualize code
• fix profiles sync which was stucked during fetch

[codecov-commenter]

Codecov Report

Merging #333 (8edc289) into main (621a81f) will increase coverage by 1.52%.
The diff coverage is 72.11%.

@@            Coverage Diff             @@
##             main     #333      +/-   ##
==========================================
+ Coverage   64.84%   66.36%   +1.52%     
==========================================
  Files          38       39       +1     
  Lines        2119     2084      -35     
  Branches      453      442      -11     
==========================================
+ Hits         1374     1383       +9     
+ Misses        621      576      -45     
- Partials      124      125       +1     

Files	Coverage Δ
...loyment_toolbelt/jobs/job_profiles_synchronizer.py	41.73% <ø> (ø)
...deployment_toolbelt/profiles/remote_git_handler.py	100.00% <100.00%> (+21.12%)	⬆️
..._deployment_toolbelt/profiles/local_git_handler.py	42.10% <30.76%> (+19.02%)	⬆️
...s_deployment_toolbelt/profiles/git_handler_base.py	75.30% <75.30%> (ø)