product/hooks: hooks service no longer requires channels service start (#21861)

app/channels.go

@@ -325,10 +325,6 @@ type hooksService struct {
 }
 
 func (s *hooksService) RegisterHooks(productID string, hooks any) error {
-	if s.ch.pluginsEnvironment == nil {
-		return errors.New("could not find plugins environment")
-	}
-
 	return s.ch.srv.hooksManager.AddProduct(productID, hooks)
 }
 

product/api.go

@@ -112,7 +112,7 @@ type ConfigService interface {
 }
 
 // HooksService is the API for adding exiting plugin hooks to the server so that they can be called as
-// they were. This Service is required to be used after the products start. Otherwise it will return an error.
+// they were. This Service is required to be accessed after the channels product initialized.
 //
 // The service shall be registered via app.HooksKey service key.
 type HooksService interface {