Update samples to use configuration properties scanning

Closes gh-12602

spring-boot-samples/spring-boot-sample-property-validation/src/main/java/sample/propertyvalidation/SampleProperties.java

@@ -17,10 +17,8 @@
 package sample.propertyvalidation;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.stereotype.Component;
 import org.springframework.validation.annotation.Validated;
 
-@Component
 @ConfigurationProperties(prefix = "sample")
 @Validated
 public class SampleProperties {