Deprecate spring.mvc.ignore-default-model-on-redirect property

Closes gh-32381

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration.java

@@ -413,9 +413,14 @@ public class WebMvcAutoConfiguration {
 				@Qualifier("mvcValidator") Validator validator) {
 			RequestMappingHandlerAdapter adapter = super.requestMappingHandlerAdapter(contentNegotiationManager,
 					conversionService, validator);
+			setIgnoreDefaultModelOnRedirect(adapter);
+			return adapter;
+		}
+
+		@SuppressWarnings("deprecation")
+		private void setIgnoreDefaultModelOnRedirect(RequestMappingHandlerAdapter adapter) {
 			adapter.setIgnoreDefaultModelOnRedirect(
 					this.mvcProperties == null || this.mvcProperties.isIgnoreDefaultModelOnRedirect());
-			return adapter;
 		}
 
 		@Override

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcProperties.java

@@ -130,10 +130,13 @@ public class WebMvcProperties {
 		return this.format;
 	}
 
+	@Deprecated
+	@DeprecatedConfigurationProperty(reason = "Deprecated for removal in Spring MVC")
 	public boolean isIgnoreDefaultModelOnRedirect() {
 		return this.ignoreDefaultModelOnRedirect;
 	}
 
+	@Deprecated
 	public void setIgnoreDefaultModelOnRedirect(boolean ignoreDefaultModelOnRedirect) {
 		this.ignoreDefaultModelOnRedirect = ignoreDefaultModelOnRedirect;
 	}