wgengine/netlog: embed the StableNodeID of the authoring node (#6105)

This allows network messages to be annotated with which node it came from.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>

wgengine/wgcfg/wgcfg_clone.go

@@ -10,6 +10,7 @@ import (
 	"net/netip"
 
 	"tailscale.com/logtail"
+	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
 )
 
@@ -33,6 +34,7 @@ func (src *Config) Clone() *Config {
 // A compilation failure here means this code must be regenerated, with the command at the top of this file.
 var _ConfigCloneNeedsRegeneration = Config(struct {
 	Name           string
+	NodeID         tailcfg.StableNodeID
 	PrivateKey     key.NodePrivate
 	Addresses      []netip.Prefix
 	MTU            uint16