697.workflow checkout tool

[singhd789]

Describe your changes

• transfer fre pp checkout functionality to fre workflow checkout
• add "workflow" section to the settings yaml (for now) to define a repo and branch to use for the pp workflow (and eventually the run workflow)
• add fre/workflow folder with freworkflow.py, tests/, checkout_script.py, README.md
• add "workflow" tool to fre.py

Issue ticket number and link (if applicable)

#697

Checklist before requesting a review

• I ran my code
• I tried to make my code readable
• I tried to comment my code
• I wrote a new test, if applicable
• I wrote new instructions/documentation, if applicable
• I ran pytest and inspected it's output
• I ran pylint and attempted to implement some of it's feedback
• No print statements; all user-facing info uses logging module

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.36%. Comparing base (ad432b1) to head (6ce4930).

Files with missing lines	Patch %	Lines
fre/workflow/checkout_script.py	83.56%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #736      +/-   ##
==========================================
+ Coverage   84.08%   84.36%   +0.28%     
==========================================
  Files          70       73       +3     
  Lines        4775     4906     +131     
==========================================
+ Hits         4015     4139     +124     
- Misses        760      767       +7     

Flag	Coverage Δ
unittests	84.36% <90.90%> (+0.28%)	⬆️

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Files with missing lines	Coverage Δ
fre/__init__.py	100.00% <100.00%> (ø)
fre/fre.py	100.00% <ø> (ø)
fre/workflow/freworkflow.py	100.00% <100.00%> (ø)
fre/workflow/tests/test_checkout_script.py	100.00% <100.00%> (ø)
fre/workflow/checkout_script.py	83.56% <83.56%> (ø)

... and 2 files with indirect coverage changes

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