Update DataSourceInitializedPublisher to always attempt to obtain the published DataSource directly from the EntityManager. In the case where the EntityManager doesn't provide a DataSource, the previous logic is used. Fixes gh-8296
Update DataSourceInitializedPublisher to always attempt to obtain the published DataSource directly from the EntityManager. In the case where the EntityManager doesn't provide a DataSource, the previous logic is used. Fixes gh-8296