Prevent early initialization of binding in ValidationAutoConfiguration

This commit replaces the use of ConfigurationProperties in
ValidationAutoConfiguration by an explicit environment check, as it
was already the case for the spring.aop.proxy-target-class property.

Closes gh-45618

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/validation/ValidationAutoConfigurationTests.java

@@ -221,6 +221,14 @@ class ValidationAutoConfigurationTests {
 			});
 	}
 
+	@Test
+	void validationUseDefaultAdaptToConstraintViolationsValue() {
+		this.contextRunner.withUserConfiguration(AnotherSampleServiceConfiguration.class).run((context) -> {
+			MethodValidationPostProcessor postProcessor = context.getBean(MethodValidationPostProcessor.class);
+			assertThat(postProcessor).hasFieldOrPropertyWithValue("adaptConstraintViolations", false);
+		});
+	}
+
 	@Test
 	@SuppressWarnings("unchecked")
 	void userDefinedMethodValidationPostProcessorTakesPrecedence() {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/validation/ValidationPropertiesTests.java

@@ -1,38 +0,0 @@
-/*
- * Copyright 2012-2025 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.autoconfigure.validation;
-
-import org.junit.jupiter.api.Test;
-
-import org.springframework.validation.beanvalidation.MethodValidationPostProcessor;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-/**
- * Tests for {@link ValidationProperties}.
- *
- * @author Andy Wilkinson
- */
-class ValidationPropertiesTests {
-
-	@Test
-	void adaptConstraintViolationsPropertyDefaultMatchesPostProcessorDefault() {
-		assertThat(new MethodValidationPostProcessor()).extracting("adaptConstraintViolations")
-			.isEqualTo(new ValidationProperties().getMethod().isAdaptConstraintViolations());
-	}
-
-}