Needed for #12860.
The client config unnecessarily omits the `livePreview.collections` and
`livePreview.globals` properties. This is because the root live preview
config extends the type with these two additional properties without
sharing it elsewhere. To led to the client sanitization function
overlooking these additional properties, as there was no type indication
that they exist.
The `collections` and `globals` properties are now appended to the
client config as expected, and the root live preview is standardized
behind the `RootLivePreviewConfig` type to ensure no properties are
lost.
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