Fixes:5181: Set-AzureRmAppServicePlan errors out for a Premium V2 App

[panchagnula]

Service plans

Description

With addition to Premium V2 the SKU name is 'P1V2' & son on instead of just P1 Or S1. The Parsing logic that tries to generate the workersize number from the SKU name wasn't handling this correctly
#5181

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[markcowl]

To avoid issues in the future, what if no digit value is found, seems like there should be a default value in this case.

Also, can you add some regression automation for this scenario? If you have verified locally, you can file an issue for test automation in a near term sprint. Please either add the test automation or link the test issue here.

[panchagnula]

Added an issue to track adding a test here #5287

[markcowl]

Test debt issue here: #5287

[markcowl]

on demand run here: https://azuresdkci.westus2.cloudapp.azure.com/view/PowerShell/job/powershell-demand/358/