remove scope.span setter

[knQzx]

remove the scope.span property setter and update internal usages to set scope._span directly. the transaction name/source propagation that was in the setter is now in Transaction.enter

fixes #5026

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Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

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Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

Langchain

• Set gen_ai.operation.name and gen_ai.pipeline.name on LLM spans by ericapisani in #5849
• Broaden AI provider detection beyond OpenAI and Anthropic by ericapisani in #5707
• Update LLM span operation to gen_ai.generate_text by ericapisani in #5796

Bug Fixes 🐛

Ci

• Use gh CLI to convert PR to draft by stephanie-anderson in #5874
• Use GitHub App token for draft PR enforcement by stephanie-anderson in #5871

Openai

• Always set gen_ai.response.streaming for Responses by alexander-alderman-webb in #5697
• Simplify Responses input handling by alexander-alderman-webb in #5695
• Use max_output_tokens for Responses API by alexander-alderman-webb in #5693
• Always set gen_ai.response.streaming for Completions by alexander-alderman-webb in #5692
• Simplify Completions input handling by alexander-alderman-webb in #5690
• Simplify embeddings input handling by alexander-alderman-webb in #5688

Other

• (google-genai) Guard response extraction by alexander-alderman-webb in #5869
• (workflow) Fix permission issue with github app and PR draft graphql endpoint by Jeffreyhung in #5887

Documentation 📚

• Update CONTRIBUTING.md with contribution requirements and TOC by stephanie-anderson in #5896

Internal Changes 🔧

Langchain

• Add text completion test by alexander-alderman-webb in #5740
• Add tool execution test by alexander-alderman-webb in #5739
• Add basic agent test with Responses call by alexander-alderman-webb in #5726
• Replace mocks with httpx types by alexander-alderman-webb in #5724
• Consolidate span origin assertion by alexander-alderman-webb in #5723
• Consolidate available tools assertion by alexander-alderman-webb in #5721

Openai

• Replace mocks with httpx types for streaming Responses by alexander-alderman-webb in #5882
• Replace mocks with httpx types for streaming Completions by alexander-alderman-webb in #5879
• Move input handling code into API-specific functions by alexander-alderman-webb in #5687

Other

• (ai) Rename generate_text to text_completion by ericapisani in #5885
• (asyncpg) Normalize query whitespace in integration by ericapisani in #5855
• Add workflow to close unvetted non-maintainer PRs by stephanie-anderson in #5895
• Exclude compromised litellm versions by alexander-alderman-webb in #5876
• Reactivate litellm tests by alexander-alderman-webb in #5853
• Add note to coordinate with assignee before PR submission by sentrivana in #5868
• Temporarily stop running litellm tests by alexander-alderman-webb in #5851

Other

• remove scope.span setter by knQzx in #5891

• ci+docs: Add draft PR enforcement by stephanie-anderson in #5867

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