SpringBoot Add ArchUnit rule to enforce declaring @Order on built-in Customizer beans

Customizer beans should declare an explicit reasonable order, it should be 0 with most case. See https://github.com/spring-projects/spring-boot/issues/36674 https://github.com/spring-projects/spring-boot/pull/36778

Comment From: wilkinsona

As per my comment on #36778, I don't think we can do this without an unacceptably high risk of a breaking change.