ref(ai): Remove unused GEN_AI_PIPELINE operation constant

[ericapisani]

Remove the legacy GEN_AI_PIPELINE operation constant. It is no longer used by any integration.

Refs PY-2143 and #5679

[linear-code]

PY-2143 Update the langchain/langgraph `on_llm_start` hook to use a different `op`

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

---

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

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) Remove unused GEN_AI_PIPELINE operation constant by ericapisani in #5886

• (asyncpg) Normalize query whitespace in integration by ericapisani in #5855
• 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

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

---

_{🤖 This preview updates automatically when you update the PR.}

[github-actions]

Codecov Results 📊

✅ 13 passed | Total: 13 | Pass Rate: 100% | Execution Time: 7.59s

📊 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 14412 uncovered lines.
✅ Project coverage is 30.2%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
consts.py	99.43%	⚠️ 2 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    25.30%    30.20%     +4.9%
==========================================
  Files          189       189         —
  Lines        20648     20647        -1
  Branches      6760      6760         —
==========================================
+ Hits          5223      6235     +1012
- Misses       15425     14412     -1013
- Partials       429       474       +45

---

Generated by Codecov Action