move GitUtils back to helix-cli (#523)

[stefan-guggisberg]

Related Issues

#523
helix-shared#29

[codecov]

Codecov Report

Merging #565 into master will increase coverage by 0.33%.
The diff coverage is 97.95%.

@@            Coverage Diff             @@
##           master     #565      +/-   ##
==========================================
+ Coverage   83.02%   83.35%   +0.33%     
==========================================
  Files          38       39       +1     
  Lines        1920     1959      +39     
  Branches      292      299       +7     
==========================================
+ Hits         1594     1633      +39     
  Misses        326      326

Impacted Files	Coverage Δ
src/config/config-utils.js	100% <100%> (ø)	⬆️
src/publish.cmd.js	74.59% <100%> (ø)	⬆️
src/git-utils.js	100% <100%> (ø)
src/deploy.cmd.js	73.77% <85.71%> (+0.11%)	⬆️

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