fix(langchain): detached spans within langchain workflows

[nirga]

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Fixes: #1541

• [ ] I have added tests that cover my changes.
• [ ] If adding a new instrumentation or changing an existing one, I've added screenshots from some observability platform showing the change.
• [ ] PR name follows conventional commits format: feat(instrumentation): ... or fix(instrumentation): ....
• [ ] (If applicable) I have updated the documentation accordingly.

[gitguardian[bot]]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

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🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
13101187	Triggered	Generic Password	c848fe71173d58277563ae675bed88d8d7904c44	packages/opentelemetry-instrumentation-langchain/tests/test_retriever.py	View secret

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