SpringBoot Short circuit @Value injection when using a source already covered by ConfigurationPropertySourcesPropertySource

Hi, I found that PropertySourcesPropertyResolver (a resolver that does not support short-circuiting) is used in these places:

LoggingSystemProperties

https://github.com/spring-projects/spring-boot/blob/08ce0919cd7895a9551018c072985d014b8cd295/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/LoggingSystemProperties.java#L165

When the key is not a property name, such as when it is a SpEL expression:

https://github.com/spring-projects/spring-boot/blob/5817c8441d4a24ca0ad6efe70bec64d22875b652/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ErrorProperties.java#L35

In this case ConfigurationPropertyName.of(key, true) will return null, and then defaultResolver (inherited from PropertySourcesPropertyResolver) will be used for resolution.

https://github.com/spring-projects/spring-boot/blob/5817c8441d4a24ca0ad6efe70bec64d22875b652/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/source/ConfigurationPropertySourcesPropertyResolver.java#L87-L97

However the entire process property value will only be retrieved once, the current implementation is fine and we don't need to make any changes.

As @philwebb commented, Boot auto-configures PropertySourcesPlaceholderConfigurer, may need to wait spring-projects/spring-framework#30304 to fix

Closes gh-28687