Update Plotter Labels

[gawebb-dstl]

Replaced 'truths_label', 'measurements_label', 'track_label' and 'sensor_label' with 'label' for all of the plotters.

This simplifies using the plot_### functions. To avoid breaking changes, the individual labels (e.g. 'truths_label') can still be used.

Make the Measurement Label for Plotters Consistent

For some plotters the measurement legend would add 'clutter' or 'detections' to end of the measure label. For other plotters it wouldn't.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.49%. Comparing base (4b6bd37) to head (c28b99a).
Report is 119 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1071      +/-   ##
==========================================
+ Coverage   94.31%   94.49%   +0.17%     
==========================================
  Files         208      208              
  Lines       13603    13633      +30     
  Branches     2767     2773       +6     
==========================================
+ Hits        12830    12882      +52     
+ Misses        522      506      -16     
+ Partials      251      245       -6     

Flag	Coverage Δ
integration	67.24% <88.15%> (+0.05%)	⬆️
unittests	91.03% <98.68%> (+0.60%)	⬆️

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[gawebb-dstl]

I've changed ###_label to label in all the examples, however it wasn't required.