feat(langchain): Record run_name in on_tool_start

[alexander-alderman-webb]

Description

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]

Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

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New Features ✨

Langchain

• Record run_name in on_tool_start by alexander-alderman-webb in #5925

• Record run_name in on_chat_model_start by alexander-alderman-webb in #5924

Other

• (integrations) Instrument pyreqwest tracing by servusdei2018 in #5682

Bug Fixes 🐛

• (langchain) Set agent name as gen_ai.agent.name for chat and tool spans by alexander-alderman-webb in #5877

Internal Changes 🔧

• (opentelemetry) Ignore mypy error by alexander-alderman-webb in #5927

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[github-actions]

Codecov Results 📊

✅ 13 passed | Total: 13 | Pass Rate: 100% | Execution Time: 10.53s

All tests are passing successfully.

❌ Patch coverage is 0.00%. Project has 14748 uncovered lines.

Files with missing lines (1)

File	Patch %	Lines
langchain.py	3.20%	⚠️ 574 Missing

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Generated by Codecov Action

[ericapisani]

I'm not going to block on the test name, but generally speaking we should try and make these more descriptive

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