fix: fix gradle caching issue (#100)

* fix: fix gradle caching issue

* remove unused import

gradle-plugins/metadata-events-generator-plugin/src/main/java/com/linkedin/metadata/gradle/tasks/GenerateMetadataEventsTask.java

@@ -6,6 +6,7 @@
 import java.io.IOException;
 import java.util.stream.Collectors;
 import javax.annotation.Nonnull;
+import org.apache.commons.io.FileUtils;
 import org.gradle.api.DefaultTask;
 import org.gradle.api.file.ConfigurableFileCollection;
 import org.gradle.api.provider.Property;
@@ -59,6 +60,12 @@ public Property<GmaEntitiesAnnotationAllowList> getEntitiesAnnotationAllowList()
   @TaskAction
   public void generateEvents() throws IOException {
     final SchemaGenerator schemaGenerator = new SchemaGenerator();
+
+    // For caching to work across git branches, this entire directory needs to be deleted. The entire directory is
+    // cached; so if anything is left in here from other branch builds it will be incorrectly cached. Delete it to
+    // ensure that it is in 100% valid state after this task (and when cached).
+    FileUtils.deleteDirectory(getOutputDirectory().getSingleFile());
+
     final String outputDir =
         getOutputDirectory().getSingleFile().toPath().resolve("com").resolve("linkedin").resolve("mxe").toString();
     schemaGenerator.generate(_resolverPaths.getFiles().stream().map(File::toString).collect(Collectors.toList()),