Improve error message when using reserved bean name

[axel7083]

Affects: v6

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I created a TransactionManager forgetting that there was already a default bean with this name. From the error message it was very hard to figure out the name overlap issue.

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.TransactionManager' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}

[snicoll]

@axel7083 bean overriding is something we'd like to deprecate (#31288) so it should throw an exception upfront, which is what happens already by default with Spring Boot for a long time.

We can't really proceed until we understand how you ended up in this situation. Please create a small sample that we can run ourselves. You can attach a zip to this issue or push the code to a separate GitHub repository.

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