cleaning up and formatting network planning tests

[atravitz]

This is some pre-work for #927 (konnekor integration), to keep that PR more legible.

Checklist

• Added a news entry

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[github-actions]

No API break detected ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.74%. Comparing base (db46003) to head (5b6d98e).
⚠️ Report is 257 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1304      +/-   ##
==========================================
+ Coverage   92.63%   92.74%   +0.10%     
==========================================
  Files         143      141       -2     
  Lines       10952    10868      -84     
==========================================
- Hits        10145    10079      -66     
+ Misses        807      789      -18     

Flag	Coverage Δ
fast-tests	92.74% <100.00%> (+0.10%)	⬆️

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