[Validation] - WASBS not supported

[GeekSheikh]

Add validation step to ensure that when Azure cloud -- check to ensure the prefix does not begin with wasbs: and if the location is mounted -- ensure that the actual path does not begin with wasbs:

As per the docs and due to file permission requirements wasbs storage is not supported https://databrickslabs.github.io/overwatch/deployoverwatch/cloudinfra/azure/#using-the-storage-account

[sriram251-code]

1)Validate rule: storage_prefix should not begin with wasbs. 2)Validate rule: If storage_prefix is a mount point then the actual source should not begin with wasbs.