FW:updating to use the PSArgumentCompleter attribute instead of validateSet

Removing ignorecase - fixing build

Author: panchagnula

src/ResourceManager/Websites/Commands.Websites/Cmdlets/AppServicePlans/SetAzureAppServicePlan.cs

@@ -13,6 +13,7 @@
 // ----------------------------------------------------------------------------------
 
 using Microsoft.Azure.Commands.WebApps.Utilities;
+using Microsoft.Azure.Commands.ResourceManager.Common.ArgumentCompleters;
 using Microsoft.Azure.Management.WebSites.Models;
 using System.Management.Automation;
 using System.Text.RegularExpressions;
@@ -33,14 +34,14 @@ public class SetAzureAppServicePlanCmdlet : AppServicePlanBaseCmdlet
         public string AdminSiteName { get; set; }
 
         [Parameter(ParameterSetName = ParameterSet1Name, Position = 3, Mandatory = false, HelpMessage = "The App Service plan tier. Allowed values are [Free|Shared|Basic|Standard|Premium|PremiumV2]")]
-        [ValidateSet("Free", "Shared", "Basic", "Standard", "Premium", "PremiumV2", "Isolated",IgnoreCase = true)]
+        [PSArgumentCompleter("Free", "Shared", "Basic", "Standard", "Premium", "PremiumV2", "Isolated")]
         public string Tier { get; set; }
 
         [Parameter(ParameterSetName = ParameterSet1Name, Position = 4, Mandatory = false, HelpMessage = "Number of Workers to be allocated.")]
         public int NumberofWorkers { get; set; }
 
         [Parameter(ParameterSetName = ParameterSet1Name, Position = 5, Mandatory = false, HelpMessage = "Size of workers to be allocated. Allowed values are [Small|Medium|Large|ExtraLarge]")]
-        [ValidateSet("Small", "Medium", "Large", "ExtraLarge", IgnoreCase = true)]
+        [PSArgumentCompleter("Small", "Medium", "Large", "ExtraLarge")]
         public string WorkerSize { get; set; }
 
         [Parameter(ParameterSetName = ParameterSet1Name, Mandatory = false, HelpMessage = "Whether or not to enable Per Site Scaling")]