chore(dataplanes): refactor out reusable routes

[johncowen]

This PR has no user visible changes, and is purely moving files around in order to make them more reusable. Its a piece of work working towards #3321

All changes are related to making any XDS Config, Stats and Clusters pages resuable across Dataplanes and ZoneIngress/Egress areas.

• Use <RouteView name="prop.routeName" /> in views I'm planning to reuse in several routes.
• Uses route prefixing in related route configuration.
• Moves remaining DataPlaneStatsView etc into ConnectionStatsView, these will be reusable across DPPs/Zones.
• Moves ConnectionInbound/OutboundSummaryOverview back to DataPlaneInbound/OutboundSummaryView. These files are very specific to DDPs only as they display Rules. These therefore belong in the dataplane module, not connections.
• Any views that I plan to share are changed to reference props.networking instead of props.dataplaneOverview.networking. networking is a property shared between ZoneIngress/Egress and Dataplanes. Currently in this PR we still use the DataPlaneNetworking type for this property, but I would guess I would use a differently named type that covers both types of resources - this will happen in a later PR.

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[schogges]

LGTM 👍