Convert CoreConfiguration to CoreAutoConfiguration

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Fixes

Overriding bean definition for bean 'propertySourcesPlaceholderConfigurer' with a different definition: replacing [Root bean: class=org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; fallback=false; factoryBeanName=null; factoryMethodName=propertySourcesPlaceholderConfigurer; initMethodNames=null; destroyMethodNames=[(inferred)]; defined in class path resource [org/springframework/boot/autoconfigure/context/PropertyPlaceholderAutoConfiguration.class]] with [Generic bean: class=org.grails.spring.context.support.GrailsPlaceholderConfigurer; scope=singleton; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; fallback=false; factoryBeanName=null; factoryMethodName=null; initMethodNames=null; destroyMethodNames=null]

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#13843