make only class in testing project public to pass javadoc task

Author: ghareeb-falazi

instrumentation/iceberg-1.8/library/build.gradle.kts

@@ -7,3 +7,9 @@ dependencies {
   library("org.apache.iceberg:iceberg-core:1.8.1")
   testImplementation(project(":instrumentation:iceberg-1.8:testing"))
 }
+
+tasks {
+  test {
+    systemProperty("collectMetadata", findProperty("collectMetadata")?.toString() ?: "false")
+  }
+}

instrumentation/iceberg-1.8/testing/src/main/java/io/opentelemetry/instrumentation/iceberg/v1_8/AbstractIcebergTest.java

@@ -38,7 +38,7 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 
-abstract class AbstractIcebergTest {
+public abstract class AbstractIcebergTest {
   protected static final int FORMAT_VERSION = 2;
   protected static final Schema SCHEMA =
       new Schema(