Track git commit id when fitting models

[damonbayer]

Closes #237

This PR enables us to track the git commit id and branch name of every model fit.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 8.06%. Comparing base (a69fa0c) to head (a4bcb50).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pipelines/forecast_state.py	0.00%	16 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #242      +/-   ##
========================================
- Coverage   8.16%   8.06%   -0.10%     
========================================
  Files         20      20              
  Lines       1311    1327      +16     
========================================
  Hits         107     107              
- Misses      1204    1220      +16     

Flag	Coverage Δ
hewr	22.02% <ø> (ø)
pipelines	0.00% <0.00%> (ø)
pyrenew_hew	1.91% <ø> (ø)

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[damonbayer]

Per Teams conversation with @dylanhmorris , this can be merged now that #249 exists.