Manage observability at entrypoint and router level

Co-authored-by: Kevin Pollet <pollet.kevin@gmail.com>

pkg/provider/kubernetes/ingress/kubernetes_test.go

@@ -115,6 +115,11 @@ func TestLoadConfigurationFromIngresses(t *testing.T) {
 								},
 								Options: "foobar",
 							},
+							Observability: &dynamic.RouterObservabilityConfig{
+								AccessLogs: pointer(true),
+								Tracing:    pointer(true),
+								Metrics:    pointer(true),
+							},
 						},
 					},
 					Services: map[string]*dynamic.Service{