Remove specification of user.* git config for docbuild and test CIs

[yarikoptic]

for tests we might need first a

• Set required git configuration for initiated test repository #113

Added a commit I recommended in that PR, so if works

• Closes Set required git configuration for initiated test repository #113
• Closes Test failure (git authentication) for datalad_fuse/tests/test_fsspec_head.py::test_git_repo on 0.5.1 #112

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.02%. Comparing base (02200a1) to head (d9d60bc).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #114   +/-   ##
=======================================
  Coverage   91.02%   91.02%           
=======================================
  Files          10       10           
  Lines         624      624           
=======================================
  Hits          568      568           
  Misses         56       56           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[yarikoptic]

benchmarks -- filed

• Benchmarking started to fail #115

otherwise -- green, thus merging