removed windows 2019 and ubuntu 20.04 files and reference

images/windows/scripts/helpers/ImageHelpers.psm1

@@ -25,7 +25,6 @@ Export-ModuleMember -Function @(
     'Get-TCToolVersionPath'
     'Test-IsWin25'
     'Test-IsWin22'
-    'Test-IsWin19'
     'Expand-7ZipArchive'
     'Get-WindowsUpdateStates'
     'Invoke-ScriptBlockWithRetry'

images/windows/scripts/helpers/InstallHelpers.ps1

@@ -356,24 +356,6 @@ function Test-IsWin22 {
     (Get-CimInstance -ClassName Win32_OperatingSystem).Caption -match "2022"
 }
 
-function Test-IsWin19 {
-    <#
-    .SYNOPSIS
-        Checks if the current Windows operating system is Windows Server 2019.
-
-    .DESCRIPTION
-        This function uses the Get-CimInstance cmdlet to retrieve information
-        about the current Windows operating system. It then checks if the Caption
-        property of the Win32_OperatingSystem class contains the string "2019",
-        indicating that the operating system is Windows Server 2019.
-
-    .OUTPUTS
-        Returns $true if the current Windows operating system is Windows Server 2019.
-        Otherwise, returns $false.
-    #>
-    (Get-CimInstance -ClassName Win32_OperatingSystem).Caption -match "2019"
-}
-
 function Expand-7ZipArchive {
     <#
     .SYNOPSIS

images/windows/scripts/helpers/VisualStudioHelpers.ps1

@@ -36,11 +36,7 @@ Function Install-VisualStudio {
     )
     
     
-    if (-not (Test-IsWin19)) {
-        $bootstrapperUrl = "https://aka.ms/vs/${Version}/postGRO-${Channel}/vs_${Edition}.exe"
-    } else {
-        $bootstrapperUrl = "https://aka.ms/vs/${Version}/${Channel}/vs_${Edition}.exe"
-    }
+    $bootstrapperUrl = "https://aka.ms/vs/${Version}/postGRO-${Channel}/vs_${Edition}.exe"
     $channelUri = "https://aka.ms/vs/${Version}/${Channel}/channel"
     $channelId = "VisualStudio.${Version}.Release"
     $productId = "Microsoft.VisualStudio.Product.${Edition}"