chore(langgraph): Remove transaction-based tracing

[alexander-alderman-webb]

Description

Remove branches for the static trace lifecycle.
Also remove manual tracing API calls in tests, as the outer transaction is no longer needed.

Closes #7098

Issues

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 88499 passed | ⏭️ 4112 skipped | Total: 92611 | Pass Rate: 95.56% | Execution Time: 285m 4s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -12790
Passed Tests	📉 -10423
Failed Tests	—
Skipped Tests	📉 -2367

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2273 uncovered lines.
✅ Project coverage is 90.27%. Comparing base (c3c44b1) to head (fe50d42).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/langgraph.py	100.00%	⚠️ 2 partials

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
+ Coverage    90.24%    90.27%    +0.03%
==========================================
  Files          193       185        -8
  Lines        25724     23362     -2362
  Branches      9504      8548      -956
==========================================
+ Hits         23214     21089     -2125
- Misses        2510      2273      -237
- Partials      1435      1350       -85

---

Generated by Codecov Action