refactor: Move @Nullable method annotations to the return type

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.staticanalysis.NullableOnMethodReturnType?organizationId=T3BlblJld3JpdGU%3D

Co-authored-by: Moderne <[email protected]>

Author: jkschneider

src/main/java/org/openrewrite/java/testing/junit5/JUnitParamsRunnerToParameterized.java

@@ -137,8 +137,7 @@ public J.Annotation visitAnnotation(J.Annotation annotation, ExecutionContext ct
             return anno;
         }
 
-        @Nullable
-        private String getLiteralAnnotationArgumentValue(J.Annotation anno) {
+        private @Nullable String getLiteralAnnotationArgumentValue(J.Annotation anno) {
             String annotationArgumentValue = null;
             if (anno.getArguments() != null && anno.getArguments().size() == 1 && anno.getArguments().get(0) instanceof J.Literal) {
                 J.Literal literal = (J.Literal) anno.getArguments().get(0);
@@ -147,8 +146,7 @@ private String getLiteralAnnotationArgumentValue(J.Annotation anno) {
             return annotationArgumentValue;
         }
 
-        @Nullable
-        private String getAnnotationArgumentForInitMethod(J.Annotation anno, String... variableNames) {
+        private @Nullable String getAnnotationArgumentForInitMethod(J.Annotation anno, String... variableNames) {
             String value = null;
             if (anno.getArguments() != null && anno.getArguments().size() == 1
                 && anno.getArguments().get(0) instanceof J.Assignment
@@ -292,8 +290,7 @@ private J.Annotation maybeReplaceParametersAnnotation(Cursor anno, String method
             return anno.getValue();
         }
 
-        @Nullable
-        private String getAnnotationArgumentValueForMethodTemplate(J.Annotation anno) {
+        private @Nullable String getAnnotationArgumentValueForMethodTemplate(J.Annotation anno) {
             String annotationArgumentValue = null;
             if (anno.getArguments() != null && anno.getArguments().size() == 1) {
                 Expression annoArg = anno.getArguments().get(0);

src/main/java/org/openrewrite/java/testing/mockito/PowerMockitoMockStaticToMockito.java

@@ -210,8 +210,7 @@ private static boolean isFieldAlreadyDefined(J.Block classBody, String fieldName
             return false;
         }
 
-        @Nullable
-        private static J.MethodDeclaration getFirstTestMethod(List<J.MethodDeclaration> methods) {
+        private static @Nullable J.MethodDeclaration getFirstTestMethod(List<J.MethodDeclaration> methods) {
             for (J.MethodDeclaration methodDeclaration : methods) {
                 for (J.Annotation annotation : methodDeclaration.getLeadingAnnotations()) {
                     if ("Test".equals(annotation.getSimpleName())) {
@@ -559,8 +558,7 @@ private J.MethodInvocation modifyWhenMethodInvocation(J.MethodInvocation whenMet
             return whenMethod;
         }
 
-        @Nullable
-        private String getDeclaringClassName(J.MethodInvocation mi) {
+        private @Nullable String getDeclaringClassName(J.MethodInvocation mi) {
             JavaType.Method methodType = mi.getMethodType();
             if (methodType != null) {
                 JavaType.FullyQualified declaringType = methodType.getDeclaringType();
@@ -569,8 +567,7 @@ private String getDeclaringClassName(J.MethodInvocation mi) {
             return null;
         }
 
-        @Nullable
-        private J.Identifier getFieldIdentifier(String fieldName) {
+        private @Nullable J.Identifier getFieldIdentifier(String fieldName) {
             return getMockedTypesFields().keySet().stream()
                     .filter(identifier -> identifier.getSimpleName().equals(fieldName)).findFirst()
                     .orElseGet(() -> {