Migrate gsutil usage to gcloud storage (#4306)

* Migrate gsutil usage to gcloud storage

* changes for 4306

* Apply automated linter fixes

* revert gsutil to gcloud

* Update model_garden_pytorch_stable_diffusion_custom.ipynb

* Update model_garden_pytorch_stable_diffusion_xl_lcm.ipynb

* Update model_garden_pytorch_deployed_model_agent_engine.ipynb

* Update model_garden_pytorch_blip_vqa.ipynb

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Co-authored-by: gurusai-voleti <gvoleti@google.com>

Author: googlyrahman