Use shared datadog-mock-intake crate and add standalone fake-intake binary

[lucaspimentel]

Overview

Consumes the new datadog-mock-intake crate from DataDog/serverless-components (#174, pinned to rev 37f5b32a853f82a00523051827af074662f3e8fa):

• The APM and DSM integration tests now use the shared crate as an ungated dev-dependency; the 317-line test-local intake fixture (tests/common/fake_intake.rs) is deleted.
• Adds a standalone mock-intake binary behind a new mock-intake feature for local APM debugging: it runs the shared crate with request summaries, stats failure injection (MOCK_INTAKE_FAIL_STATS_FIRST_N), and JSON dumps (MOCK_INTAKE_DUMP_DIR). See bottlecap/README.md for the workflow.
• CI clippy now compiles the mock-intake feature so the binary stays checked. Test runs are unchanged: the integration tests run in every feature set.

Stacked on serverless-components#174: this PR's dependency pins rev 37f5b32a853f82a00523051827af074662f3e8fa, the head of that PR's branch (re-pinned to its current head after the mock-intake rename commit). Merge #174 first (or re-pin if its head moves).

Supersedes #1385, which introduced the intake as a bottlecap library module; that implementation now lives in the shared crate.

Testing

• cargo test -p bottlecap (default): 693 tests passed, 0 failed, including apm_integration_test (19) and dsm_integration_test (1), which previously ran only behind a feature flag and now run by default.
• cargo build -p bottlecap --features mock-intake: clean. cargo clippy --workspace --all-targets across default / fips / mock-intake feature sets: no lint warnings.
• dd-rust-license-tool check: passes (no new third-party dependencies; the crate is first-party).
• Manual smoke: ran the mock-intake binary with failure injection and a dump directory, POSTed a gzip msgpack StatsPayload to /api/v0.2/stats: 202 Accepted, mock-intake: summary line with grouped hits and normalized aggregation key, and a JSON dump containing the decoded payload; SIGINT shutdown clean.

[datadog-prod-us1-3]

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[lucaspimentel]

Note to self: rename fake-intake to mock-intake

[lucaspimentel]

@DataDog review

[datadog-prod-us1-3]

More details

The shared intake preserves the migrated integration-test contract, and the standalone binary remains gated from production builds.

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