remove webhook checker deploy in inttest

[apedriza]

currently it floods the controller with errors like:

2025-12-03T16:08:52Z	ERROR	admission	unable to process a request with unknown content type	{"webhookGroup": "k0smotron.io", "webhookKind": "Cluster", "error": "contentType=, expected application/json"}
sigs.k8s.io/controller-runtime/pkg/webhook/admission.(*Webhook).ServeHTTP
	/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.20.4/pkg/webhook/admission/http.go:95
sigs.k8s.io/controller-runtime/pkg/webhook/internal/metrics.InstrumentedHook.InstrumentHandlerInFlight.func1
	/go/pkg/mod/github.com/prometheus/client_golang@v1.22.0/prometheus/promhttp/instrument_server.go:60
net/http.HandlerFunc.ServeHTTP
	/usr/local/go/src/net/http/server.go:2220
github.com/prometheus/client_golang/prometheus/promhttp.InstrumentHandlerCounter.func1
	/go/pkg/mod/github.com/prometheus/client_golang@v1.22.0/prometheus/promhttp/instrument_server.go:147
net/http.HandlerFunc.ServeHTTP
	/usr/local/go/src/net/http/server.go:2220
github.com/prometheus/client_golang/prometheus/promhttp.InstrumentHandlerDuration.func2
	/go/pkg/mod/github.com/prometheus/client_golang@v1.22.0/prometheus/promhttp/instrument_server.go:109
net/http.HandlerFunc.ServeHTTP
	/usr/local/go/src/net/http/server.go:2220
net/http.(*ServeMux).ServeHTTP
	/usr/local/go/src/net/http/server.go:2747
net/http.serverHandler.ServeHTTP
	/usr/local/go/src/net/http/server.go:3210
net/http.initALPNRequest.ServeHTTP
	/usr/local/go/src/net/http/server.go:3819
net/http.(*http2serverConn).runHandler
	/usr/local/go/src/net/http/h2_bundle.go:6249

We already have webhook readyz checker