Add better typing in jinja_static.py

[peterallenwebb]

Added type annotations. Cleaned up.

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.15%. Comparing base (5db0b81) to head (7fe927c).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10835      +/-   ##
==========================================
- Coverage   89.15%   89.15%   -0.01%     
==========================================
  Files         183      183              
  Lines       23418    23422       +4     
==========================================
+ Hits        20878    20881       +3     
- Misses       2540     2541       +1     

Flag	Coverage Δ
integration	86.37% <91.66%> (-0.01%)	⬇️
unit	62.11% <66.66%> (+<0.01%)	⬆️

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Components	Coverage Δ
Unit Tests	62.11% <66.66%> (+<0.01%)	⬆️
Integration Tests	86.37% <91.66%> (-0.01%)	⬇️