SONAR-11252 fix error after deleting provisioned project (#693)

server/sonar-web/src/main/js/app/components/ComponentContainer.tsx

@@ -89,6 +89,7 @@ export class ComponentContainer extends React.PureComponent<Props, State> {
 
   componentWillUnmount() {
     this.mounted = false;
+    window.clearTimeout(this.watchStatusTimer);
   }
 
   addQualifier = (component: Component) => ({