289 circular graph error

[AnniekStok]

Add an extra check for duplicate nodes when creating the candidate graph from segmentation. Raise a ValueError if duplicates are found, which should be caught by MotileTracker, and request updating the MotileRun with relabeled segmentation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.63%. Comparing base (7e53086) to head (fe1533e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #159   +/-   ##
=======================================
  Coverage   90.63%   90.63%           
=======================================
  Files          57       57           
  Lines        2850     2852    +2     
=======================================
+ Hits         2583     2585    +2     
  Misses        267      267           

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