chore: Migrate gsutil usage to gcloud storage (#4528)

Author: gurusai-voleti

bigtable-dataflow-parent/bigtable-beam-import/src/test/java/com/google/cloud/bigtable/beam/hbasesnapshots/EndToEndIT.java

@@ -78,7 +78,7 @@
  * End to end integration test for pipeline that import HBase snapshot data into Cloud Bigtable and
  * validates the imported data with SyncTable.
  * Prepare test data with gsutil(https://cloud.google.com/storage/docs/quickstart-gsutil):
- * gsutil -m cp -r <PATH_TO_REPO>/bigtable-dataflow-parent/bigtable-beam-import/src/test/integration-test \
+ * gcloud storage cp --recursive <PATH_TO_REPO>/bigtable-dataflow-parent/bigtable-beam-import/src/test/integration-test \
  *  gs://<test_bucket>/cloud-data-dir/
  */
 public class EndToEndIT {

bigtable-dataflow-parent/bigtable-hbase-beam/README.md

@@ -75,6 +75,5 @@ p
 
 p.run();
 
-// Once this is done, you can get the result file via "gsutil cp <resultLocation>-00000-of-00001"
+// Once this is done, you can get the result file via "gcloud storage cp <resultLocation>-00000-of-00001"
 ```
-