Expand LangGraph Tests

[TimPansino]

Overview

• Adds unit tests for LangGraph context propagation in pregel_executor.
• Adds more StateGraph testing.

Related Github Issue

Covers regression of #1739 and #1742

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	8		0	0	0.88s
✅ MARKDOWN	markdownlint	7	0	0	0	1.36s
✅ PYTHON	ruff	1037	0	0	0	0.96s
✅ PYTHON	ruff-format	1037	0	0	0	0.42s
✅ YAML	prettier	19	0	0	0	1.58s
✅ YAML	v8r	19		0	0	5.79s
✅ YAML	yamllint	19		0	0	0.68s

See detailed reports in MegaLinter artifacts

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.04%. Comparing base (9022f11) to head (c5c904a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1745      +/-   ##
==========================================
- Coverage   82.07%   82.04%   -0.04%     
==========================================
  Files         215      215              
  Lines       26309    26309              
  Branches     4150     4150              
==========================================
- Hits        21592    21584       -8     
- Misses       3304     3307       +3     
- Partials     1413     1418       +5     

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