Exclude cloud shell storage accounts from storage account name rule

[BernieWhite]

Description of the issue

Storage accounts automatically created for Azure Cloud Shell are prefixed with cs instead of st.

Expected behaviour

The CAF standard should be excluded for storage accounts with the "ms-resource-usage": "azure-cloud-shell" tag.

Module in use and version:

• Module: PSRule.Rules.CAF
• Version: 0.1.0-B2101004

Captured output from $PSVersionTable:

Name                           Value
----                           -----
PSVersion                      7.1.0
PSEdition                      Core
GitCommitId                    7.1.0
OS                             Microsoft Windows 10.0.19042
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0