first pass: use unrendered external.location for state:modified source comparison

[MichelleArk]

Resolves ##12350

Problem

Solution

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]

Additional Artifact Review Required

Changes to artifact directory files requires at least 2 approvals from core team members.

[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

❌ Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.37%. Comparing base (3bab0f7) to head (b5bebb1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12367      +/-   ##
==========================================
+ Coverage   91.31%   91.37%   +0.05%     
==========================================
  Files         203      203              
  Lines       25092    25121      +29     
==========================================
+ Hits        22914    22954      +40     
+ Misses       2178     2167      -11     

Flag	Coverage Δ
integration	88.24% <96.55%> (+0.11%)	⬆️
unit	65.29% <44.82%> (-0.03%)	⬇️

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Components	Coverage Δ
Unit Tests	65.29% <44.82%> (-0.03%)	⬇️
Integration Tests	88.24% <96.55%> (+0.11%)	⬆️

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