[Tests] fix smoke test race condition on first run

[aylei]

Fix the following error when I ran pytest tests/test_smoke.py on my laptop, which cause test failure:

D 12-20 16:53:56 provisioner.py:153] Traceback (most recent call last):
D 12-20 16:53:56 provisioner.py:153]   File "/Users/aylei/repo/skypilot-org/skypilot/sky/provision/provisioner.py", line 142, in bulk_provision
D 12-20 16:53:56 provisioner.py:153]     return _bulk_provision(cloud, region, cluster_name,
D 12-20 16:53:56 provisioner.py:153]   File "/Users/aylei/repo/skypilot-org/skypilot/sky/provision/provisioner.py", line 60, in _bulk_provision
D 12-20 16:53:56 provisioner.py:153]     config = provision.bootstrap_instances(provider_name, region_name,
D 12-20 16:53:56 provisioner.py:153]   File "/Users/aylei/repo/skypilot-org/skypilot/sky/provision/__init__.py", line 52, in _wrapper
D 12-20 16:53:56 provisioner.py:153]     return impl(*args, **kwargs)
D 12-20 16:53:56 provisioner.py:153]   File "/Users/aylei/repo/skypilot-org/skypilot/sky/provision/aws/config.py", line 71, in bootstrap_instances
D 12-20 16:53:56 provisioner.py:153]     node_cfg['IamInstanceProfile'] = _configure_iam_role(iam)
D 12-20 16:53:56 provisioner.py:153]   File "/Users/aylei/repo/skypilot-org/skypilot/sky/provision/aws/config.py", line 161, in _configure_iam_role
D 12-20 16:53:56 provisioner.py:153]     iam.meta.client.create_instance_profile(
D 12-20 16:53:56 provisioner.py:153]   File "/opt/homebrew/anaconda3/envs/sky/lib/python3.10/site-packages/botocore/client.py", line 569, in _api_ca
ll
D 12-20 16:53:56 provisioner.py:153]     return self._make_api_call(operation_name, kwargs)
D 12-20 16:53:56 provisioner.py:153]   File "/opt/homebrew/anaconda3/envs/sky/lib/python3.10/site-packages/botocore/client.py", line 1023, in _make_
api_call
D 12-20 16:53:56 provisioner.py:153]     raise error_class(parsed_response, operation_name)
D 12-20 16:53:56 provisioner.py:153] botocore.errorfactory.EntityAlreadyExistsException: An error occurred (EntityAlreadyExists) when calling the Cr
eateInstanceProfile operation: Instance Profile skypilot-v1 already exists.

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)
• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_aws_stale_job_manual_restart
• Backward compatibility tests: conda deactivate; bash -i tests/backward_compatibility_tests.sh