fix: drop no-op install script that triggers Yarn build warning

[BridgeAR]

Summary

Yarn Berry (Plug'n'Play) prints YN0007: @datadog/pprof must be built for any dependency that declares an install/preinstall/postinstall script, including the no-op "install": "exit 0". The package ships prebuilt binaries and excludes binding.gyp from the published tarball, so a consumer has nothing to build. The script only suppressed npm's implicit node-gyp rebuild in the dev tree; CI and the prepare script build explicitly.

Dropping it stops the spurious warning for downstream Yarn Berry users, e.g. dd-trace on Vercel/Next.js.

A regression test (ts/test/test-no-build-scripts.ts) asserts the manifest declares no build lifecycle scripts.

Note (out of scope)

package.json has a postinstall key at the top level (outside scripts; the nan/Node-24 sed fix). npm and Yarn ignore it there, so it does not trigger YN0007, but it also means that fix never runs. Left untouched here; worth a separate look.

Test plan

• CI green (build, asan, valgrind, lint/gts)
• yarn add @datadog/pprof under Yarn Berry no longer prints YN0007

Refs: DataDog/dd-trace-js#5432

[datadog-datadog-prod-us1]

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Overall package size

Self size: 2.19 MB
Deduped: 2.89 MB
No deduping: 2.89 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | pprof-format | 2.2.2 | 500.53 kB | 500.53 kB | | source-map | 0.7.6 | 185.63 kB | 185.63 kB | | node-gyp-build | 4.8.4 | 13.86 kB | 13.86 kB |

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