[0.83] Add unstable_fastRefreshComplete CDP event

[huntie]

Target Branch

0.83-stable

Link to commit or PR to be picked

facebook/react-native#56399

Description

Adds a new, experimental ReactNativeApplication.unstable_fastRefreshComplete CDP event, emitted to subscribed active CDP sessions when a Fast Refresh update completes.

This feature is not gated by a feature flag, but is marked unstable_ and is not observed by any current infra.

[github-actions]

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If your Pick Request does not satisfy the criteria below, please close it as it will not be considered.

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[gabrieldonadel]

Merged in 5d09e437f745c8fde6ec66d75d9d16edceb16310 ✅