SpringBoot Add disk space health indicator's path to its details and log message (2.6.x)

Follow-up for https://github.com/spring-projects/spring-boot/pull/31998 on 2.6.x

Comment From: bclozel

Thanks @rreich, but we're not backporting features (especially changes in REST APIs) in maintenance versions. #31998 was scheduled for the next 3.0.0 milestone with that in mind.

Comment From: rreich

Ok, thank you.