fix(dogstatsd): Move Windows Named Pipes into a Cargo Feature

[Lewis-E]

What does this PR do?

• Move windows named pipes into a feature. See: https://doc.rust-lang.org/cargo/reference/features.html

Motivation

• AWS/non-windows can exclude this code at the build level

Describe how to test/QA your changes

• CI success for windows build + existing unit tests

[duncanista]

I think this might be missing the field to be marked as a feature in the constructor of dogstatsd?

[Lewis-E]

Not quite LLM 2-shotted :)

[duncanista]

Looks good on the dogstatsd side, left a comment – not sure if you need the feature on the other crates? But I really don't understand how and where those products are used

[duncanista]

LGTM on the dogstatsd side

[Copilot]

Pull request overview

This PR moves Windows named-pipe support behind an explicit windows-pipes Cargo feature so non-Windows/AWS builds can exclude named-pipe code (and related Tokio features) at compile time.

Changes:

• Added windows-pipes feature flags and updated #[cfg(...)] guards across crates/tests.
• Reduced default Tokio features in dogstatsd, enabling io-util only when windows-pipes is enabled.
• Updated Windows CI build for datadog-serverless-compat to build with --features windows-pipes.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
crates/dogstatsd/tests/integration_test.rs	Gate named-pipe tests/imports and config fields behind windows-pipes.
crates/dogstatsd/src/dogstatsd.rs	Gate named-pipe transport types/logic behind windows-pipes.
crates/dogstatsd/Cargo.toml	Add windows-pipes feature; move tokio/io-util behind feature.
crates/datadog-trace-agent/tests/integration_test.rs	Gate named-pipe test/helpers and config fields behind windows-pipes.
crates/datadog-trace-agent/tests/common/helpers.rs	Gate named-pipe helper behind windows-pipes.
crates/datadog-trace-agent/src/trace_processor.rs	Conditionally include Windows pipe config fields in unit-test config.
crates/datadog-trace-agent/src/mini_agent.rs	Gate named-pipe server import/serve logic behind windows-pipes and adjust config handling.
crates/datadog-trace-agent/src/config.rs	Gate Windows pipe config fields/env parsing behind windows-pipes (and test).
crates/datadog-trace-agent/Cargo.toml	Introduce windows-pipes feature flag.
crates/datadog-serverless-compat/src/main.rs	Gate reading/passing named-pipe config behind windows-pipes.
crates/datadog-serverless-compat/Cargo.toml	Add windows-pipes feature that enables dependent crate features.
.github/workflows/build-datadog-serverless-compat.yml	Enable windows-pipes feature for Windows build.

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