[piaskowyk]

Summary

Same change as #51, targeting rea4-discord.

Flips the preventShadowTreeCommitExhaustion React Native feature flag default to true.

This is a prerequisite for enabling Reanimated's DISABLE_COMMIT_PAUSING_MECHANISM static feature flag, which removes the jittering of animated components (e.g. sticky headers) while scrolling. Per the Reanimated docs, enabling DISABLE_COMMIT_PAUSING_MECHANISM without this flag can starve React commits and make the app unresponsive.

Upstream, the flag is ossReleaseStage: 'experimental' with expectedReleaseValue: true, so it is only reachable via the experimental release level. We enable it on its own instead of switching the release level, which would also turn on unrelated flags such as fixTextClippingAndroid15useBoundsForWidth.

The change is made in ReactNativeFeatureFlags.config.js, with the C++, Kotlin and JS files regenerated via yarn featureflags --update, following the same pattern as the earlier [Discord] Enable feature flags commit. It is regenerated on this branch rather than cherry-picked, since the SignedSource hashes differ from 0.86.0-discord.

Test plan

• yarn featureflags reports no drift between the config and the generated files
• Build the app from source on Android and iOS, verify no commit-related regressions or ANRs
• Smoke test scrolling with animated/sticky headers with Reanimated 4 and DISABLE_COMMIT_PAUSING_MECHANISM enabled

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