When a single bean causes a dependency cycle the failure analysis does not clearly illustrate the cycle

[Haarolean]

From now on, if a bean depends on itself we'll get such a message:

The dependencies of some of the beans in the application context form a cycle:

┌──->──┐
|  bean defined in org.springframework.boot.diagnostics.analyzer.BeanCurrentlyInCreationFailureAnalyzerTests$SelfReferenceBeanConfiguration
└──<-──┘

Closes #26269.

[snicoll]

@Haarolean thank you for making your first contribution to Spring Boot.