Trigger configuration properties annotation processsor on `@Endpoint`

We generate metadata for `@Endpoint` annotated types so the annotation
processor need to indicate that it supports the endpoint annotation.

See gh-23580

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessor.java

@@ -60,6 +60,7 @@ import org.springframework.boot.configurationprocessor.metadata.ItemMetadata;
  * @since 1.2.0
  */
 @SupportedAnnotationTypes({ ConfigurationMetadataAnnotationProcessor.CONFIGURATION_PROPERTIES_ANNOTATION,
+		ConfigurationMetadataAnnotationProcessor.ENDPOINT_ANNOTATION,
 		"org.springframework.context.annotation.Configuration" })
 public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor {
 

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java

@@ -72,7 +72,8 @@ class ConfigurationMetadataAnnotationProcessorTests extends AbstractMetadataGene
 	void supportedAnnotations() {
 		assertThat(new ConfigurationMetadataAnnotationProcessor().getSupportedAnnotationTypes())
 				.containsExactlyInAnyOrder("org.springframework.boot.context.properties.ConfigurationProperties",
-						"org.springframework.context.annotation.Configuration");
+						"org.springframework.context.annotation.Configuration",
+						"org.springframework.boot.actuate.endpoint.annotation.Endpoint");
 	}
 
 	@Test