[Windows][Improvement] Split and simplify "InitializeVM.ps1" script (#3806)

* improve InitializeVM script

* Update windows2019.json

* remove configs

* resolve comments

* resolve comments; fix order

* fix templates

images/win/scripts/Installers/Install-Choco.ps1

@@ -0,0 +1,32 @@
+Write-Host "Set TLS1.2"
+[Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor "Tls12"
+
+Write-Host "Install chocolatey"
+$chocoExePath = 'C:\ProgramData\Chocolatey\bin'
+
+# Add to system PATH
+$systemPath = [Environment]::GetEnvironmentVariable('Path', [System.EnvironmentVariableTarget]::Machine)
+$systemPath += ';' + $chocoExePath
+[Environment]::SetEnvironmentVariable("PATH", $systemPath, [System.EnvironmentVariableTarget]::Machine)
+
+# Update local process' path
+$userPath = [Environment]::GetEnvironmentVariable('Path', [System.EnvironmentVariableTarget]::User)
+if ($userPath) {
+    $env:Path = $systemPath + ";" + $userPath
+} else {
+    $env:Path = $systemPath
+}
+
+# Run the installer
+Invoke-Expression ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1'))
+
+# Turn off confirmation
+choco feature enable -n allowGlobalConfirmation
+
+# https://github.com/chocolatey/choco/issues/89
+# Remove some of the command aliases, like `cpack` #89
+Remove-Item -Path $env:ChocolateyInstall\bin\cpack.exe -Force
+
+# Initialize environmental variable ChocolateyToolsLocation by invoking choco Get-ToolsLocation function
+Import-Module "$env:ChocolateyInstall\helpers\chocolateyInstaller.psm1" -Force
+Get-ToolsLocation