Chore(vertexai): remove unused (commented out) samples (#10234)

Delete file GroundingWithPublicData.java and test
Delete file GroundingWithPrivateData.java and test

Author: alarconesparza

vertexai/snippets/src/main/java/vertexai/gemini/GroundingWithPrivateData.java

@@ -23,15 +23,13 @@
 
 import com.google.cloud.testing.junit4.MultipleAttemptsRule;
 import com.google.gson.Gson;
-import com.google.gson.annotations.SerializedName;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.PrintStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.util.Arrays;
-import java.util.Base64;
 import java.util.stream.Collectors;
 import javax.net.ssl.HttpsURLConnection;
 import org.junit.After;
@@ -192,28 +190,6 @@ public void testVideoAudioInput() throws IOException {
     assertThat(output).ignoringCase().contains("Tokyo");
   }
 
-  // @Test
-  // public void testGroundingWithPublicData() throws Exception {
-  //   String output =
-  //       GroundingWithPublicData.groundWithPublicData(PROJECT_ID, LOCATION, GEMINI_FLASH_1_5);
-
-  //   assertThat(output).ignoringCase().contains("Rayleigh");
-  // }
-
-  // @Test
-  // public void testGroundingWithPrivateData() throws Exception {
-  //   String output =
-  //       GroundingWithPrivateData.groundWithPrivateData(
-  //           PROJECT_ID,
-  //           LOCATION,
-  //           GEMINI_FLASH,
-  //           String.format(
-  //               "projects/%s/locations/global/collections/default_collection/dataStores/%s",
-  //               PROJECT_ID, DATASTORE_ID));
-
-  //   assertThat(output).ignoringCase().contains("DMV");
-  // }
-
   @Test
   public void testMultimodalStreaming() throws Exception {
     StreamingMultimodal.streamingMultimodal(PROJECT_ID, LOCATION, GEMINI_FLASH);