Ignore spring-framework-bom project in global config

This commit ensures that the spring-framework-bom project is ignored
from the global configuration block. If not, many conventions and
dependencies are added to it and add noise to the published BOM.

See gh-23282

build.gradle

@@ -49,7 +49,7 @@ ext {
 	}
 }
 
-configure(allprojects) { project ->
+configure(allprojects.findAll { (it.name != "spring-framework-bom") } ) { project ->
 	group = "org.springframework"
 
 	apply plugin: "java"

spring-framework-bom/spring-framework-bom.gradle

@@ -1,5 +1,6 @@
 description = "Spring Framework (Bill of Materials)"
 
+apply plugin: "java"
 apply plugin: "maven"
 
 configurations.archives.artifacts.clear()