Fix Add Multiple DeferredRepositoryInitializationListener in RepositoryConfigurationDelegate

[xeounxzxu]

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@mp911de

hello.

I changed the content for the following reasons.

issue: spring-projects/spring-data-jpa#3495

If you use two or more EnableJpaRepositories and use DEFERRED bootstrap mode, an error that the bean cannot be registered will occur.

Logic was added to check the presence of a bean. And we ran a repository check as a test case.