refactor: Automatically select recipe examples from the unit test cases of a recipe

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

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

Author: timtebeek

src/test/java/org/openrewrite/java/testing/hamcrest/HamcrestNotMatcherToAssertJTest.java

@@ -16,6 +16,7 @@
 package org.openrewrite.java.testing.hamcrest;
 
 import org.junit.jupiter.api.Test;
+import org.openrewrite.DocumentExample;
 import org.openrewrite.InMemoryExecutionContext;
 import org.openrewrite.java.JavaParser;
 import org.openrewrite.test.RecipeSpec;
@@ -34,6 +35,7 @@ public void defaults(RecipeSpec spec) {
               "assertj-core-3.24"));
     }
 
+    @DocumentExample
     @Test
     void notMatcher() {
         rewriteRun(