Always on doesn't apply to elastic premium plans

[BernieWhite]

Description of the issue

The rule Azure.AppService.AlwaysOn doesn't apply to function apps hosted on elastic premium plans.

Expected behaviour

This rule should not apply to function apps on elastic premium plans. As when alwaysOn is set deployment fails.

Module in use and version:

• Module: PSRule.Rules.Azure
• Version: 1.8.0-B2108026

Captured output from $PSVersionTable:

Name                           Value
----                           -----
PSVersion                      7.1.4
PSEdition                      Core
GitCommitId                    7.1.4
OS                             Microsoft Windows 10.0.19043
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0