Avoid writing extra devices when using IntanRecordingInterface with multiple electrode groups

[h-mayorquin]

As in the title.

This is after #1164 as that laid the ground-work for this.

The problem is the last time I hardcoded that we only add the IntanDevice to the first group. The other groups have a default Device and that's where the extra ones come from.

I added a test and fixed this.

[h-mayorquin]

Also blocked by #1175:

See the error here:
https://github.com/catalystneuro/neuroconv/actions/runs/12753555210/job/35545502312?pr=1167

[h-mayorquin]

All tests are passing now that we have merged #1175 @weiglszonja

[weiglszonja]

Lgtm, thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.07%. Comparing base (96dfdff) to head (41314de).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1167      +/-   ##
==========================================
- Coverage   90.69%   90.07%   -0.62%     
==========================================
  Files         129      129              
  Lines        8189     8285      +96     
==========================================
+ Hits         7427     7463      +36     
- Misses        762      822      +60     

Flag	Coverage Δ
unittests	90.07% <100.00%> (-0.62%)	⬇️

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

Files with missing lines	Coverage Δ
...datainterfaces/ecephys/intan/intandatainterface.py	100.00% <100.00%> (ø)

... and 17 files with indirect coverage changes