Add data type validation to AzureCloudContainerConnection.upload_object()

[DanPaseltiner]

The upload_object() method on the AzureCloudContainerConnection class allows users to write data to Azure blob storage. Currently we support this data being provided as either a string or dictionary. However, we do not currently validate the type of message argument to ensure that it is either str or dict. This results in the failing silently when the type of message is anything else e.g. None. To resolve this we should implement some data type validation on message so that when it is a type not currently supported by upload_object() we raise an exception.

Acceptance Criteria:

GIVEN the AzureCloudContainerConnection class
WHEN the upload_object() method is called with a value for message that is not str or dict
THEN a ValueError exception is raised that clearly explains the issue to the user