ci(langchain): remove vcr requests in favor of custom mocks

[sabrenner]

wip: testing against CI with changes to reduce flaky tests

MLOB-1924

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

tests/contrib/langchain/cassettes/cohere_completion_sync_0_2.yaml       @DataDog/ml-observability
tests/contrib/langchain/cassettes/cohere_completion_sync_latest.yaml    @DataDog/ml-observability
tests/snapshots/tests.contrib.langchain.test_langchain.test_cohere_llm_sync_0_2.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_lcel_chain_batch_async.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_chat_model_sync_call_langchain_openai_async.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_chat_model_vision_generate_0_2.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_chat_model_vision_generate_latest.json  @DataDog/apm-python
riotfile.py                                                             @DataDog/apm-python
tests/contrib/langchain/cassettes/openai_chat_completion_async_generate.yaml  @DataDog/ml-observability
tests/contrib/langchain/conftest.py                                     @DataDog/ml-observability
tests/contrib/langchain/test_langchain.py                               @DataDog/ml-observability
tests/snapshots/tests.contrib.langchain.test_langchain.test_ai21_llm_sync.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_cohere_llm_sync.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_lcel_chain_batch.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_lcel_chain_complicated.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_lcel_chain_simple.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_lcel_chain_simple_async.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_lcel_with_tools_openai.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_chat_model_async_generate.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_chat_model_sync_call_langchain_openai.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_chat_model_sync_generate.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_chat_model_vision_generate.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_llm_async.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_llm_error.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_llm_sync.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_openai_llm_sync_multiple_prompts.json  @DataDog/apm-python
tests/snapshots/tests.contrib.langchain.test_langchain.test_pinecone_vectorstore_similarity_search.json  @DataDog/apm-python
.riot/requirements/12135c7.txt                                          @DataDog/apm-python
.riot/requirements/1282607.txt                                          @DataDog/apm-python
.riot/requirements/13d45e0.txt                                          @DataDog/apm-python
.riot/requirements/14825e2.txt                                          @DataDog/apm-python
.riot/requirements/159ccae.txt                                          @DataDog/apm-python
.riot/requirements/173c2c6.txt                                          @DataDog/apm-python
.riot/requirements/1e5948b.txt                                          @DataDog/apm-python
.riot/requirements/6c3ea5e.txt                                          @DataDog/apm-python
.riot/requirements/6f5fdb6.txt                                          @DataDog/apm-python
.riot/requirements/a69ef68.txt                                          @DataDog/apm-python
.riot/requirements/eddebbc.txt                                          @DataDog/apm-python

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: sabrenner/langchain-use-custom-mocks
Commit report: 3b1ca0e
Test service: dd-trace-py

✅ 0 Failed, 130 Passed, 1184 Skipped, 3m 13.08s Total duration (26m 4.23s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-11 21:01:20

Comparing candidate commit 3b1ca0e in PR branch sabrenner/langchain-use-custom-mocks with baseline commit 848c921 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 394 metrics, 2 unstable metrics.