Add dedicated test for SSHRemoteIO directory handling

[mih]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.28% 🎉

Comparison is base (8b76391) 96.93% compared to head (e98d438) 97.22%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   96.93%   97.22%   +0.28%     
==========================================
  Files          15       15              
  Lines         196      216      +20     
==========================================
+ Hits          190      210      +20     
  Misses          6        6              

Files Changed	Coverage Δ
datalad_ria/tests/test_ssh_remote_io.py	100.00% <100.00%> (ø)

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