test: update test to use prefix generator for tableId so it'll get cl… (googleapis#2458)

…eaned up Test table ids generated from prefix generator are cleaned up by https://togithub.com/googleapis/java-bigtable/blob/main/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/test_helpers/env/TestEnvRule.java#L148. Updating SampleRowsIT test to use PrefixGenerator in case the delete failed.

Author: mutianf

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/it/SampleRowsIT.java

@@ -29,6 +29,7 @@
 import com.google.cloud.bigtable.data.v2.models.KeyOffset;
 import com.google.cloud.bigtable.data.v2.models.RowMutation;
 import com.google.cloud.bigtable.test_helpers.env.EmulatorEnv;
+import com.google.cloud.bigtable.test_helpers.env.PrefixGenerator;
 import com.google.cloud.bigtable.test_helpers.env.TestEnvRule;
 import com.google.common.collect.Lists;
 import com.google.protobuf.ByteString;
@@ -106,7 +107,7 @@ public void testOnAuthorizedView()
  }
 
  private static AuthorizedView createPreSplitTableAndAuthorizedView() {
- String tableId = UUID.randomUUID().toString();
+ String tableId = PrefixGenerator.newPrefix("SampleRowsIT#AuthorizedView");
  String authorizedViewId = UUID.randomUUID().toString();
 
  testEnvRule