Fix flaky InfinispanWebSocketSubscriptionIT test

This test failed already two times in different kogito builds
PR 1241: link to build
PR 1374: link to build

In both cases with kiegroup_kogito_apps/data-index/data-index-service/data-index-service-infinispan/src/test/java/org/kie/kogito/index/graphql/InfinispanWebSocketSubscriptionIT.java:1 | java.util.concurrent.TimeoutException error