BF: Run an actual git invocation with interactive commit config

[adswa]

Fixes #7397

[codeclimate]

Code Climate has analyzed commit b528574 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.25 🎉

Comparison is base (01e9831) 91.34% compared to head (b528574) 91.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7398      +/-   ##
==========================================
+ Coverage   91.34%   91.59%   +0.25%     
==========================================
  Files         325      325              
  Lines       43300    43318      +18     
  Branches     5775     5781       +6     
==========================================
+ Hits        39551    39676     +125     
+ Misses       3731     3627     -104     
+ Partials       18       15       -3     

Impacted Files	Coverage Δ
datalad/support/gitrepo.py	92.03% <ø> (+0.74%)	⬆️

... and 22 files with indirect coverage changes

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[adswa]

The next failure is unrelated

[adswa]

I'm taking @yarikoptic's thumbs-up as an approval. I've tested locally that I get an interactive commit message entry when setting the config variable on the latest state of this PR.

[yarikoptic-gitmate]

PR released in 0.19.0