Fix extra electrode groups ephys

[h-mayorquin]

Should fix #1163.

Also related to #932 as that should be more or less the last place where we did not priority set.

[pauladkisson]

Looks good!

[h-mayorquin]

Thanks for the review @pauladkisson

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.75%. Comparing base (96dfdff) to head (c8f91c7).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1164      +/-   ##
==========================================
+ Coverage   90.69%   90.75%   +0.06%     
==========================================
  Files         129      129              
  Lines        8189     8286      +97     
==========================================
+ Hits         7427     7520      +93     
- Misses        762      766       +4     

Flag	Coverage Δ
unittests	90.75% <100.00%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...erfaces/ecephys/baserecordingextractorinterface.py	93.87% <100.00%> (+0.06%)	⬆️

... and 3 files with indirect coverage changes