As of `@wordpress/api-fetch@3.0.0` (introduced in 44812), the `apiFetch` nonce middleware must have its nonce value assigned explicitly, and will no longer listen for heartbeat ticks automatically. This changeset adds an inline script for the default registration of the `api-fetch` script handle to assign the nonce value in response to the heartbeat action. In doing so, it removes the now-unused, misnamed `rest-nonce` property from the heartbeat response, whose original introduction served as temporary compatibility with earlier versions of `@wordpress/api-fetch`.
See https://github.com/WordPress/gutenberg/pull/13451
See #45113
Props adamsilverstein, nerrad .
Fixes#46107 .
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