Remove experimental table support form CockroachDB with Testcontainers

[I don't think it's needed anymore](https://github.com/hibernate/hibernate-reactive/blob/27acfb2ee1b9af38966762b72bd50d8e2d7b3b72/hibernate-reactive-core/src/test/java/org/hibernate/reactive/containers/CockroachDBDatabase.java#L68)