Change the webhook name to pipeline-webhook

The "webhook" name is too generic and it creates conflicts on leases
when other services (like triggers) that use leader election run in
same namespace but with different configuration.

Fixes #3529

Co-authored-by: Matt Moore <mattmoor@vmware.com>

Signed-off-by: Andrea Frittoli <andrea.frittoli@uk.ibm.com>

cmd/webhook/main.go

@@ -232,7 +232,10 @@ func main() {
 		log.Fatal(http.ListenAndServe(":"+port, mux))
 	}()
 
-	sharedmain.WebhookMainWithConfig(ctx, "webhook",
+	// NOTE(afrittoli) - we should have the name "webhook-pipeline"
+	// configurable. Once the change is done on knative/pkg side
+	// knative/eventing#4530 we can inherit it from it
+	sharedmain.WebhookMainWithConfig(ctx, "webhook-pipeline",
 		sharedmain.ParseAndGetConfigOrDie(),
 		certificates.NewController,
 		newDefaultingAdmissionController,