Polish "Fail fast with explicit error message for incompatible JDK version"

See spring-projectsgh-46818

Author: mhalbritter

buildSrc/build.gradle

@@ -22,6 +22,10 @@ plugins {
 	id "org.jetbrains.dokka" version "2.1.0"
 }
 
+if (!JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_24)) {
+	throw new GradleException("This build requires Java 24 or newer to run, but you are currently using Java ${JavaVersion.current()}")
+}
+
 repositories {
 	mavenCentral()
 	gradlePluginPortal()

settings.gradle

@@ -47,11 +47,6 @@ rootProject.name="spring-boot-build"
 enableFeaturePreview("STABLE_CONFIGURATION_CACHE")
 
 settings.gradle.projectsLoaded {
-	ensureCompatibleJavaVersion -> {
-		if (!JavaVersion.current().isCompatibleWith(JavaVersion.toVersion(24))) {
-			throw new GradleException("Java 24 or newer is needed to compile. Java version used is ${JavaVersion.current().toString()}.")
-		}
-	}
 	develocity {
 		buildScan {
 			def toolchainVersion = settings.gradle.rootProject.findProperty('toolchainVersion')