TST: Don't use deprecated AnnexRepo.add_urls

[bpoldrack]

This method was deprecated. Don't use it in tests, that are not
specifically testing this method.

Follow up to #6667

Changelog

🛡 Tests

• Remove usage of deprecated AnnexRepo.add_urls in tests

[qlty-cloud-legacy]

Code Climate has analyzed commit 7c06f28 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #6683 (7c06f28) into master (89475e7) will increase coverage by 55.78%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master    #6683       +/-   ##
===========================================
+ Coverage   34.63%   90.42%   +55.78%     
===========================================
  Files         353      353               
  Lines       45655    45673       +18     
===========================================
+ Hits        15814    41299    +25485     
+ Misses      29841     4374    -25467     

Impacted Files	Coverage Δ
datalad/customremotes/tests/test_datalad.py	97.61% <100.00%> (+97.61%)	⬆️
datalad/local/tests/test_add_archive_content.py	99.62% <100.00%> (+99.62%)	⬆️
datalad/support/tests/test_annexrepo.py	97.87% <100.00%> (+97.87%)	⬆️
datalad/core/local/tests/test_create.py	98.39% <0.00%> (+0.40%)	⬆️
datalad/core/local/create.py	99.29% <0.00%> (+0.70%)	⬆️
datalad/interface/base.py	91.28% <0.00%> (+1.02%)	⬆️
datalad/core/local/save.py	98.91% <0.00%> (+1.08%)	⬆️
datalad/_version.py	47.70% <0.00%> (+1.27%)	⬆️
datalad/dataset/gitrepo.py	96.75% <0.00%> (+1.38%)	⬆️
datalad/core/distributed/push.py	92.54% <0.00%> (+1.56%)	⬆️
... and 285 more

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