chore: change GCP env to correct one (#706)

Author: munkhuushmgl

automl/snippets/src/test/java/com/example/automl/ListOperationStatusTest.java

@@ -41,7 +41,7 @@
 
 @RunWith(JUnit4.class)
 public class ListOperationStatusTest {
-  private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
+  private static final String PROJECT_ID = System.getenv("AUTOML_PROJECT_ID");
   private ByteArrayOutputStream bout;
   private PrintStream out;
   private PrintStream originalPrintStream;