Spring-ai GH-907: Change vector store schema init default

• Change default schema initialization of vector stores from true to false. Users need to explicitly opt-in for schema initialization by setting the initialize-schema property on the corresponding vector store.
• Update integration tests
• Update copyright years

Resolves https://github.com/spring-projects/spring-ai/issues/907

Comment From: markpollack

fixed in 50d34b8a486b83d5d380ce6dfd70dcbe219444af