Remove unused imports

Author: sakthivelmanii

samples/snippets/src/main/java/com/example/spanner/admin/archived/SpannerSample.java

@@ -48,7 +48,6 @@
 import com.google.cloud.spanner.SpannerException;
 import com.google.cloud.spanner.SpannerExceptionFactory;
 import com.google.cloud.spanner.SpannerOptions;
-import com.google.cloud.spanner.SpannerOptions.Builder.DefaultReadWriteTransactionOptions;
 import com.google.cloud.spanner.Statement;
 import com.google.cloud.spanner.Struct;
 import com.google.cloud.spanner.TimestampBound;
@@ -64,7 +63,6 @@
 import com.google.spanner.admin.database.v1.RestoreDatabaseMetadata;
 import com.google.spanner.admin.database.v1.UpdateDatabaseDdlMetadata;
 import com.google.spanner.v1.ExecuteSqlRequest.QueryOptions;
-import com.google.spanner.v1.TransactionOptions.IsolationLevel;
 import java.math.BigDecimal;
 import java.time.Instant;
 import java.util.ArrayList;