Remove only on view

[TeunHuijben]

This PR adds helper functions to only remove nodes/edges from the view (GraphView), not the _root graph.

Let's keep this PR open until I finalize things on the motile side, to see if everything works as desired

[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.87234% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.90%. Comparing base (14b92ec) to head (3750250).

Files with missing lines	Patch %	Lines
src/tracksdata/graph/_graph_view.py	97.87%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #292      +/-   ##
==========================================
+ Coverage   87.73%   87.90%   +0.17%     
==========================================
  Files          57       57              
  Lines        4890     4919      +29     
  Branches      862      870       +8     
==========================================
+ Hits         4290     4324      +34     
+ Misses        378      375       -3     
+ Partials      222      220       -2     

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