Resolve Viewport separately from Metadata (#77427)
Viewport blocks the root while Metadata no longer does. However Metadata
requires the reading of dynamic params for things like icon loading and
other features that require the path whereas viewport does not. Reading
the path in fallback prerenders is considered dynamic when DIO is
enabled which means that any dynamic route with a file based metadata
such as an icon will trigger dynamic at the root.
To Address this we simply resolve viewport separately from metadata.
