Fix LangChain Tests

[TimPansino]

Overview

• Minor subset of changes from LangChain / LangGraph Agent Instrumentation #1630 to repair failing LangChain tests.
  • The rest of the test changes should come from that PR later.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	7		0	0	0.87s
✅ MARKDOWN	markdownlint	7	0	0	0	1.21s
✅ PYTHON	ruff	960	0	0	0	1.04s
✅ PYTHON	ruff-format	960	0	0	0	0.32s
✅ YAML	prettier	15	0	0	0	1.38s
✅ YAML	v8r	15		0	0	5.71s
✅ YAML	yamllint	15		0	0	0.65s

See detailed reports in MegaLinter artifacts

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.67%. Comparing base (a7ade08) to head (14b0326).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1631      +/-   ##
==========================================
- Coverage   81.69%   81.67%   -0.03%     
==========================================
  Files         209      209              
  Lines       24392    24392              
  Branches     3870     3870              
==========================================
- Hits        19928    19921       -7     
- Misses       3154     3162       +8     
+ Partials     1310     1309       -1     

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