chore(llmobs): remove docs on previously removed pc sampling feature

[Yun-Kim]

MLOB-4495

Description

Cleans up outdated public docs on already-removed beta prompt-completion sampling feature for our OpenAI/VertexAI/Langchain/Anthropic/Bedrock integrations. We had previously removed them in 3.x but forgot to remove the corresponding integration doc sections.

Also cleans up unused code and integration configs which are remnants of that removed feature (note that these are not breaking changes, tagging APM integration spans with prompt/completion tags was already removed and publicly-documented in release notes in the 3.11 minor release).

Testing

Risks

Additional Notes

[sabrenner]

one wording nit but can ignore, yeet it

[brettlangdon]

lgtm

[github-actions]

CODEOWNERS have been resolved as:

ddtrace/contrib/internal/anthropic/__init__.py                          @DataDog/ml-observability
ddtrace/contrib/internal/anthropic/patch.py                             @DataDog/ml-observability
ddtrace/contrib/internal/botocore/__init__.py                           @DataDog/apm-core-python @DataDog/apm-idm-python
ddtrace/contrib/internal/botocore/patch.py                              @DataDog/apm-core-python @DataDog/apm-idm-python
ddtrace/contrib/internal/langchain/__init__.py                          @DataDog/ml-observability
ddtrace/contrib/internal/openai/__init__.py                             @DataDog/ml-observability
ddtrace/contrib/internal/openai/patch.py                                @DataDog/ml-observability
ddtrace/contrib/internal/vertexai/__init__.py                           @DataDog/ml-observability
ddtrace/contrib/internal/vertexai/patch.py                              @DataDog/ml-observability
ddtrace/llmobs/_integrations/base.py                                    @DataDog/ml-observability
tests/contrib/openai/test_openai_v1.py                                  @DataDog/ml-observability
tests/llmobs/test_llmobs_integrations.py                                @DataDog/ml-observability

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 259 ± 3 ms.

The average import time from base is: 261 ± 3 ms.

The import time difference between this PR and base is: -2.2 ± 0.1 ms.

Import time breakdown

The following import paths have grown:

ddtrace.auto 0.074 ms (0.03%)

ddtrace.bootstrap.sitecustomize 0.074 ms (0.03%)

ddtrace._trace.trace_handlers 0.048 ms (0.02%)

ddtrace.bootstrap.preload 0.025 ms (0.01%)

ddtrace.internal.settings.crashtracker 0.025 ms (0.01%)

The following import paths have shrunk:

ddtrace.auto 6.134 ms (2.37%)

ddtrace.bootstrap.sitecustomize 3.592 ms (1.39%)

ddtrace.bootstrap.preload 3.592 ms (1.39%)

ddtrace.internal.settings.dynamic_instrumentation 0.661 ms (0.26%)

ddtrace.internal.remoteconfig.worker 0.639 ms (0.25%)

ddtrace.internal.remoteconfig.client 0.529 ms (0.20%)

ddtrace 2.543 ms (0.98%)

ddtrace._logger 0.636 ms (0.25%)

ddtrace.internal.telemetry 0.636 ms (0.25%)

ddtrace.internal.telemetry.writer 0.636 ms (0.25%)

ddtrace.internal.utils.version 0.636 ms (0.25%)

ddtrace.trace 0.578 ms (0.22%)

ddtrace.internal._unpatched 0.026 ms (0.01%)

json 0.026 ms (0.01%)

json.decoder 0.026 ms (0.01%)

re 0.026 ms (0.01%)

enum 0.026 ms (0.01%)

types 0.026 ms (0.01%)