configuration-processor: detect @nullable on TYPE_USE parameters

Update MetadataGenerationEnvironment#getAnnotation to also inspect
type-use annotations (element.asType().getAnnotationMirrors()) in
addition to declaration annotations. This ensures that @nullable
on method parameter types is correctly detected when generating
configuration metadata for Actuator endpoints.

Previously, parameters annotated with @nullable in TYPE_USE
position could be missed, causing them to be marked as required
in metadata. With this change, both declaration-level and
type-use @nullable annotations are recognized.

No new dependencies are introduced, and existing public APIs
remain unchanged.

Signed-off-by: wonyongg <[email protected]>

Author: wonyongg

configuration-metadata/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/MetadataGenerationEnvironment.java

@@ -265,6 +265,12 @@ AnnotationMirror getAnnotation(Element element, String type) {
 					return annotation;
 				}
 			}
+
+			for (AnnotationMirror annotation : element.asType().getAnnotationMirrors()) {
+				if (type.equals(annotation.getAnnotationType().toString())) {
+					return annotation;
+				}
+			}
 		}
 		return null;
 	}