Fix tree data associators to work with particle states

[sdhiscocks]

No description provided.

[codecov]

Codecov Report

Merging #662 (bf4333d) into main (c4cd36c) will increase coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main     #662      +/-   ##
==========================================
+ Coverage   94.43%   94.45%   +0.02%     
==========================================
  Files         168      168              
  Lines        8429     8429              
  Branches     1630     1630              
==========================================
+ Hits         7960     7962       +2     
+ Misses        348      346       -2     
  Partials      121      121              

Flag	Coverage Δ
integration	67.70% <0.00%> (ø)
unittests	92.09% <66.66%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
stonesoup/dataassociator/tree.py	97.02% <66.66%> (+1.98%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c4cd36c...bf4333d. Read the comment docs.