Polish restoration of ConfigFileApplicationListener

See gh-27303

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/ConfigDataEnvironmentPostProcessor.java

@@ -129,6 +129,7 @@ public class ConfigDataEnvironmentPostProcessor implements EnvironmentPostProces
 		getLegacyListener().addPropertySources(environment, resourceLoader);
 	}
 
+	@SuppressWarnings("deprecation")
 	LegacyConfigFileApplicationListener getLegacyListener() {
 		return new LegacyConfigFileApplicationListener(this.logFactory.getLog(ConfigFileApplicationListener.class));
 	}
@@ -200,6 +201,7 @@ public class ConfigDataEnvironmentPostProcessor implements EnvironmentPostProces
 		postProcessor.postProcessEnvironment(environment, resourceLoader, additionalProfiles);
 	}
 
+	@SuppressWarnings("deprecation")
 	static class LegacyConfigFileApplicationListener extends ConfigFileApplicationListener {
 
 		LegacyConfigFileApplicationListener(Log logger) {

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/ConfigDataEnvironmentPostProcessorTests.java

@@ -71,6 +71,7 @@ class ConfigDataEnvironmentPostProcessorTests {
 	private ArgumentCaptor<ResourceLoader> resourceLoaderCaptor;
 
 	@Test
+	@Deprecated
 	void defaultOrderMatchesDeprecatedListener() {
 		assertThat(ConfigDataEnvironmentPostProcessor.ORDER).isEqualTo(ConfigFileApplicationListener.DEFAULT_ORDER);
 	}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/ConfigFileApplicationListenerTests.java

@@ -72,6 +72,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  * @author Scott Frederick
  * @author Nguyen Bao Sach
  */
+@Deprecated
 @ExtendWith({ OutputCaptureExtension.class, UseLegacyProcessing.class })
 class ConfigFileApplicationListenerTests {