[UX] Better hint when GCP project is wrongly typed in auth

[Michaelvll]

Currently, if a user types a wrong project ID in gcloud init, sky check will pass but cause an issue when sky launch:

  File "/Users/xxx/anaconda3/envs/sky/lib/python3.10/site-packages/sky/backends/backend_utils.py", line 979, in write_cluster_config
    _add_auth_to_cluster_config(cloud, tmp_yaml_path)
  File "/Users/xxx/anaconda3/envs/sky/lib/python3.10/site-packages/sky/backends/backend_utils.py", line 1034, in _add_auth_to_cluster_config
    config = auth.setup_gcp_authentication(config)
  File "/Users/xxx/anaconda3/envs/sky/lib/python3.10/site-packages/sky/utils/common_utils.py", line 402, in method_with_retries
    return method(*args, **kwargs)
  File "/Users/xxx/anaconda3/envs/sky/lib/python3.10/site-packages/sky/authentication.py", line 159, in setup_gcp_authentication
    project = compute.projects().get(project=project_id).execute()
  File "/Users/xxx/anaconda3/envs/sky/lib/python3.10/site-packages/googleapiclient/discovery.py", line 1122, in method
    for pvalue in pvalues:

Version & Commit info:

• sky -v: PLEASE_FILL_IN
• sky -c: PLEASE_FILL_IN