SpringBoot @Persistent should not be considered when scanning for Couchbase entities

In https://github.com/spring-projects/spring-data-couchbase/issues/1121, Spring Data Couchbase will stop looking for @Persistent when scanning for entities. Spring Boot's CouchbaseDataConfiguration should align with this change.

Comment From: scottfrederick

Unblocked by https://github.com/spring-projects/spring-data-couchbase/commit/351370ba4d0f166a6c59c5a92bcd179bea97c688

Comment From: snicoll

Closing in favor of PR #28124