Fix Entities Default Path

[MattToast]

Make default path for Models, Ensembles, and Orchestrators the current working directory at runtime when constructing manually.

Fixes #556

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.17%. Comparing base (d7d979e) to head (befa872).
⚠️ Report is 28 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #808      +/-   ##
===========================================
- Coverage    83.91%   80.17%   -3.74%     
===========================================
  Files           83       78       -5     
  Lines         6284     6093     -191     
===========================================
- Hits          5273     4885     -388     
- Misses        1011     1208     +197     

Files with missing lines	Coverage Δ
smartsim/database/orchestrator.py	78.67% <ø> (-7.09%)	⬇️
smartsim/entity/ensemble.py	99.35% <100.00%> (+0.09%)	⬆️
smartsim/entity/entityList.py	96.00% <ø> (-4.00%)	⬇️
smartsim/entity/model.py	96.04% <100.00%> (-0.04%)	⬇️

... and 38 files with indirect coverage changes

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