appc,ipn/ipnlocal: Add split DNS entries for conn25 peers

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If conn25 config is sent in the netmap: add split DNS entries to use
appropriately tagged peers' PeerAPI to resolve DNS requests for those
domains.

This will enable future work where we use the peers as connectors for
the configured domains.

Updates tailscale/corp#34252

Signed-off-by: Fran Bull <fran@tailscale.com>

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