add auto_remove and fix NodeNotAvailable error

[PythonFZ]

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (3d5b44f) 86.48% compared to head (5b01882) 86.51%.

❗ Current head 5b01882 differs from pull request most recent head a51662e. Consider uploading reports for the commit a51662e to get more accurate results

Files	Patch %	Lines
zntrack/project/zntrack_project.py	88.46%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #751      +/-   ##
==========================================
+ Coverage   86.48%   86.51%   +0.03%     
==========================================
  Files          25       25              
  Lines        1990     2017      +27     
  Branches      835      858      +23     
==========================================
+ Hits         1721     1745      +24     
- Misses        269      272       +3     

Flag	Coverage Δ
fulltest	86.51% <89.65%> (+0.03%)	⬆️

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