[CI] Unit tests for Azure

[parasj]

Continuation of #525

[parasj]

@abiswal2001 This PR fails with a single Azure test as follows:

pytest tests/unit_azure                                                                                                                                                                                                                                                                                                       ✘ 130 
=================================================================================================================================================================== test session starts ====================================================================================================================================================================
platform darwin -- Python 3.8.13, pytest-7.1.2, pluggy-1.0.0
rootdir: /Users/paras/code/skylark
plugins: anyio-3.5.0
collected 1 item                                                                                                                                                                                                                                                                                                                                           

tests/unit_azure/test_azure_blob_interface.py F                                                                                                                                                                                                                                                                                                      [100%]

========================================================================================================================================================================= FAILURES =========================================================================================================================================================================
__________________________________________________________________________________________________________________________________________________________________ test_azure_singlepart ___________________________________________________________________________________________________________________________________________________________________

    def test_azure_singlepart():
        bucket_name = f"test{str(uuid.uuid4()).replace('-', '')[-20:]}/{str(uuid.uuid4()).replace('-', '')}"
>       assert interface_test_framework("azure:eastus", bucket_name, False, test_delete_bucket=True)

tests/unit_azure/test_azure_blob_interface.py:9: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/interface_util.py:29: in interface_test_framework
    interface.upload_object(fpath, obj_name)
skyplane/obj_store/azure_blob_interface.py:153: in upload_object
    blob_client = self._run_azure_op_with_retry(
skyplane/obj_store/azure_blob_interface.py:113: in _run_azure_op_with_retry
    return fn()
/opt/homebrew/Caskroom/miniconda/base/lib/python3.8/site-packages/azure/core/tracing/decorator.py:73: in wrapper_use_tracer
    return func(*args, **kwargs)
/opt/homebrew/Caskroom/miniconda/base/lib/python3.8/site-packages/azure/storage/blob/_container_client.py:978: in upload_blob
    blob.upload_blob(
/opt/homebrew/Caskroom/miniconda/base/lib/python3.8/site-packages/azure/core/tracing/decorator.py:73: in wrapper_use_tracer
    return func(*args, **kwargs)
/opt/homebrew/Caskroom/miniconda/base/lib/python3.8/site-packages/azure/storage/blob/_blob_client.py:716: in upload_blob
    return upload_block_blob(**options)
/opt/homebrew/Caskroom/miniconda/base/lib/python3.8/site-packages/azure/storage/blob/_upload_helpers.py:168: in upload_block_blob
    process_storage_error(error)
/opt/homebrew/Caskroom/miniconda/base/lib/python3.8/site-packages/azure/storage/blob/_shared/response_handlers.py:181: in process_storage_error
    exec("raise error from None")   # pylint: disable=exec-used # nosec
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

>   ???
E   azure.core.exceptions.HttpResponseError: This request is not authorized to perform this operation using this permission.
E   RequestId:a7f51e99-b01e-002f-7e11-c4542d000000
E   Time:2022-09-09T06:03:22.6483764Z
E   ErrorCode:AuthorizationPermissionMismatch
E   Content: <?xml version="1.0" encoding="utf-8"?><Error><Code>AuthorizationPermissionMismatch</Code><Message>This request is not authorized to perform this operation using this permission.
E   RequestId:a7f51e99-b01e-002f-7e11-c4542d000000
E   Time:2022-09-09T06:03:22.6483764Z</Message></Error>

<string>:1: HttpResponseError
------------------------------------------------------------------------------------------------------------------------------------------------------------------- Captured stderr call -------------------------------------------------------------------------------------------------------------------------------------------------------------------
23:02:58 [DEBUG] Creating storage account test4060853cf871d88d2df7
23:03:20 [DEBUG] Creating container 18603a38f04e4884828584071b787bf0
================================================================================================================================================================= short test summary info ==================================================================================================================================================================
FAILED tests/unit_azure/test_azure_blob_interface.py::test_azure_singlepart - azure.core.exceptions.HttpResponseError: This request is not authorized to perform this operation using this permission.
==================================================================================================================================================================== 1 failed in 27.67s ====================================================================================================================================================================