Add Project(git_only_repo: bool)

[PythonFZ]

This option integrated:

The DVC graph relies on file outputs for connecting stages.
ZnTrack will use a '--outs' for each stage by default.
This will require a DVC remote to be setup.
If a project is not used with a DVC remote and strictly GIT,
this can be set to True and instead '--metrics-no-cache' will be used.
Metrics is used instead of 'outs-no-cache' to keep the DVC run cache.

TODO

• check if removing metrics still is different from removing an dvc tracked output. Run a command and then interrupt it. Then try checkout.
• check that the default outs is --metrics-no-cache with ´node-meta.json´

[codecov]

Codecov Report

Merging #677 (c1c4405) into main (47b9e00) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #677      +/-   ##
==========================================
+ Coverage   90.11%   90.13%   +0.02%     
==========================================
  Files          21       21              
  Lines        1649     1653       +4     
  Branches      661      664       +3     
==========================================
+ Hits         1486     1490       +4     
  Misses        163      163              

Flag	Coverage Δ
fulltest	90.13% <100.00%> (+0.02%)	⬆️

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

Files Changed	Coverage Δ
zntrack/core/node.py	93.17% <100.00%> (+0.10%)	⬆️
zntrack/fields/field.py	94.36% <100.00%> (ø)
zntrack/fields/zn/__init__.py	91.87% <100.00%> (ø)
zntrack/project/zntrack_project.py	90.94% <100.00%> (+0.03%)	⬆️

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