PERF: Buffer size optimization from datalad-next

[bpoldrack]

This is a trivial patch from datalad-next, that significantly improves performance of save,status, etc. b/c of a much too small buffer when the runner is reading output.

Closes #7190

[yarikoptic]

CI is red across the board, didn't look in detail but smth is "off".

[bpoldrack]

Oops. Introduced a circular import consts <-> utils.

[codecov]

Codecov Report

Base: 88.71% // Head: 88.72% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (e889b0d) compared to base (9d3818f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            maint    #7250      +/-   ##
==========================================
+ Coverage   88.71%   88.72%   +0.01%     
==========================================
  Files         326      326              
  Lines       44420    44423       +3     
  Branches     5919     5919              
==========================================
+ Hits        39407    39415       +8     
+ Misses       4998     4993       -5     
  Partials       15       15              

Impacted Files	Coverage Δ
datalad/runner/runnerthreads.py	97.50% <100.00%> (+0.02%)	⬆️
datalad/utils.py	87.97% <100.00%> (+0.02%)	⬆️
datalad/support/gitrepo.py	92.49% <0.00%> (-0.08%)	⬇️
datalad/_version.py	45.68% <0.00%> (ø)
datalad/tests/utils_pytest.py	89.18% <0.00%> (+0.10%)	⬆️
datalad/tests/test_utils.py	97.45% <0.00%> (+0.13%)	⬆️
datalad/distributed/ora_remote.py	79.80% <0.00%> (+0.27%)	⬆️
datalad/local/tests/test_add_archive_content.py	99.62% <0.00%> (+0.37%)	⬆️
datalad/support/tests/test_sshrun.py	100.00% <0.00%> (+1.72%)	⬆️

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[yarikoptic]

Changelog needs tune

[bpoldrack]

Ok, fixed changelog, ubuntu's repos are available again and everything passed except for the "old nose code" action with fails during setup. This is #7259 and I'm going to ignore it for this PR. Merging.

[yarikoptic-gitmate]

PR released in 0.18.1