feat(kuma-dp): disable application probe proxy by default on Universal (

#12002)

## Motivation

fixes #11854

## Implementation information

`kuma-dp` decides whether to start the application probe proxy according
to port settings on `applicationProbeProxyServer.port`, when it's
configured to `0`, the server won't start.

It was set to `9001` by default. So now change this default value to
"not set", which will be actually `0`.
On Kubernetes, we have another injector configuration item which still
defaults to `9901`, it will eventually be applied to the `kuma-dp`
process in the pod. Users can use environment variable and data plane
pod annotation to configure this port. So the functionality of the
feature is not impacted at all.

## Supporting documentation


https://kuma.io/docs/2.9.x/policies/service-health-probes/#application-probe-proxy

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Signed-off-by: Jay Chen <[email protected]>

pkg/config/app/kuma-dp/config.go

@@ -49,7 +49,7 @@ var DefaultConfig = func() Config {
 			CoreDNSLogging:            false,
 		},
 		ApplicationProbeProxyServer: ApplicationProbeProxyServer{
-			Port: 9001,
+			Port: 0,
 		},
 	}
 }

pkg/config/app/kuma-dp/testdata/default-config.golden.yaml

@@ -1,5 +1,4 @@
-applicationProbeProxyServer:
-  port: 9001
+applicationProbeProxyServer: {}
 controlPlane:
   caCert: ""
   caCertFile: ""