fix(cohere): Stop setting transaction status when child span fails

[alexander-alderman-webb]

Description

Stop modifying the transaction, since the transaction may not be managed by cohere.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• 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 📊

✅ 282 passed | Total: 282 | Pass Rate: 100% | Execution Time: 43.71s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 14892 uncovered lines.
✅ Project coverage is 33.42%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
cohere.py	87.90%	⚠️ 15 Missing and 14 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    32.43%    33.42%    +0.99%
==========================================
  Files          190       190         —
  Lines        22369     22367        -2
  Branches      7594      7594         —
==========================================
+ Hits          7254      7475      +221
- Misses       15115     14892      -223
- Partials       694       744       +50

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