Explicitly build the babel plugin in benchmarks CI

[jonathanmos]

What does this PR do?

Fixes a CI failure. benchmarks/babel.config.js now loads @datadog/mobile-react-native-babel-plugin to enable SVG tracking, but yarn install doesn't actually build that package's lib/ output — Yarn Berry only runs install/postinstall automatically, not prepare, so the plugin's rm -rf lib && yarn bob build step was never executing in CI. Added an explicit build step for the plugin right after yarn install. Reproduced the exact CI error locally (Cannot find module '.../lib/commonjs/index') and confirmed this fix resolves it.

Motivation

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Additional Notes

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Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• If this PR is auto-generated, please make sure also to manually update the code related to the change

[Copilot]

Pull request overview

This PR fixes a benchmarks CI failure by ensuring @datadog/mobile-react-native-babel-plugin is explicitly built during the benchmarks pipeline so its lib/ output exists when benchmarks/babel.config.js loads the plugin.

Changes:

• Add a CI step after the root yarn install to run the babel plugin’s prepare script (which builds lib/ via yarn bob build).
• Document why this is needed with an inline comment referencing Yarn Berry behavior around prepare.

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[datadog-datadog-prod-us1-2]

 

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⚠️ Warnings

🚦 1 Pipeline job failed

DataDog/dd-sdk-reactnative | build-and-upload:app     

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

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