ipn/ipnlocal,tailcfg: don't send WireIngress if IngressEnabled already true (#14960)

Hostinfo.WireIngress is used as a hint that the node intends to use
funnel. We now send another field, IngressEnabled, in cases where
funnel is explicitly enabled, and the logic control-side has
been changed to look at IngressEnabled as well as WireIngress in all
cases where previously the hint was used - so we can now stop sending
WireIngress when IngressEnabled is true to save some bandwidth.

Updates tailscale/tailscale#11572
Updates tailscale/corp#25931

Signed-off-by: Irbe Krumina <irbe@tailscale.com>

ipn/ipnlocal/local_test.go

@@ -5084,7 +5084,7 @@ func TestUpdateIngressLocked(t *testing.T) {
 				},
 			},
 			wantIngress:       true,
-			wantWireIngress:   true,
+			wantWireIngress:   false, // implied by wantIngress
 			wantControlUpdate: true,
 		},
 		{
@@ -5111,7 +5111,6 @@ func TestUpdateIngressLocked(t *testing.T) {
 			name: "funnel_enabled_no_change",
 			hi: &tailcfg.Hostinfo{
 				IngressEnabled: true,
-				WireIngress:    true,
 			},
 			sc: &ipn.ServeConfig{
 				AllowFunnel: map[ipn.HostPort]bool{
@@ -5119,7 +5118,7 @@ func TestUpdateIngressLocked(t *testing.T) {
 				},
 			},
 			wantIngress:     true,
-			wantWireIngress: true,
+			wantWireIngress: false, // implied by wantIngress
 		},
 		{
 			name: "funnel_disabled_no_change",
@@ -5137,7 +5136,6 @@ func TestUpdateIngressLocked(t *testing.T) {
 			name: "funnel_changes_to_disabled",
 			hi: &tailcfg.Hostinfo{
 				IngressEnabled: true,
-				WireIngress:    true,
 			},
 			sc: &ipn.ServeConfig{
 				AllowFunnel: map[ipn.HostPort]bool{
@@ -5157,8 +5155,8 @@ func TestUpdateIngressLocked(t *testing.T) {
 					"tailnet.xyz:443": true,
 				},
 			},
-			wantWireIngress:   true,
 			wantIngress:       true,
+			wantWireIngress:   false, // implied by wantIngress
 			wantControlUpdate: true,
 		},
 	}