Reactive session factory bean for Observability should use CqlSessionBuilder #1366
Description
imperative - https://github.com/spring-projects/spring-data-cassandra/blob/main/spring-data-cassandra/src/main/java/org/springframework/data/cassandra/observability/ObservableCqlSessionFactoryBean.java#L52
reactive - https://github.com/spring-projects/spring-data-cassandra/blob/main/spring-data-cassandra/src/main/java/org/springframework/data/cassandra/observability/ObservableReactiveSessionFactoryBean.java
reference issue spring-cloud/spring-cloud-sleuth#2277