Update part about listing session blobs from `wvdportalstorageblob` storage account in article: Deploy AVD Using TF and AADDS

[schnerring]

It seems like Microsoft disabled listing blobs for that storage container, so we can’t peek into it anymore.

See comment:

https://schnerring.net/blog/deploy-azure-virtual-desktop-avd-using-terraform-and-azure-active-directory-domain-services-aadds/#remark42__comment-c5a08400-8323-4a31-ac49-4af79fa6fe0c