TST: redistribute windows tests across workers to harmonize runtime

[adswa]

This is an attempt to fix #6193, but we will have to take a look at the actual runtimes with this change

[adswa]

I have cancelled all CIs except for Appveyor, which should be the only thing affected by this change.

[codecov]

Codecov Report

Merging #6200 (6c943cb) into master (615910d) will decrease coverage by 1.32%.
The diff coverage is 92.40%.

❗ Current head 6c943cb differs from pull request most recent head 5ed2f72. Consider uploading reports for the commit 5ed2f72 to get more accurate results

@@            Coverage Diff             @@
##           master    #6200      +/-   ##
==========================================
- Coverage   89.71%   88.39%   -1.33%     
==========================================
  Files         319      319              
  Lines       41663    41712      +49     
==========================================
- Hits        37378    36871     -507     
- Misses       4285     4841     +556     

Impacted Files	Coverage Δ
datalad/support/external_versions.py	94.87% <ø> (ø)
datalad/tests/test_utils.py	96.07% <84.84%> (-1.25%)	⬇️
datalad/distribution/dataset.py	96.26% <85.71%> (-0.38%)	⬇️
datalad/interface/base.py	89.51% <100.00%> (+0.05%)	⬆️
datalad/interface/utils.py	91.33% <100.00%> (ø)
datalad/utils.py	83.66% <100.00%> (-1.01%)	⬇️
datalad/version.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/plugin/wtf.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/plugin/addurls.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/interface/clean.py	0.00% <0.00%> (-100.00%)	⬇️
... and 81 more

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[adswa]

moving one more test around to improve this further

[adswa]

I think it is better balanced now:

[mih]

Thanks for doing this!