[Windows] Docker, .NET Core and NPM improvements (#3811)

* improve InitializeVM script

* Update windows2019.json

* remove configs

* resolve comments

* resolve comments; fix order

* fix templates

* move Node.js packages to toolset

* dotnet warmup and merge docker scripts

* Update Node.Tests.ps1

* Update Install-Docker.ps1

* fix node.js tests

* fix npm package installation

* Update Install-NodeLts.ps1

* fix tests

* fix test

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

@@ -21,14 +21,9 @@ $env:npm_config_prefix = $PrefixPath
 npm config set cache $CachePath --global
 npm config set registry https://registry.npmjs.org/
 
-npm install -g cordova
-npm install -g grunt-cli
-npm install -g gulp-cli
-npm install -g parcel-bundler
-npm install -g --save-dev webpack webpack-cli
-npm install -g yarn
-npm install -g lerna
-npm install -g node-sass
-npm install -g newman
+$globalNpmPackages = (Get-ToolsetContent).npm.global_packages
+$globalNpmPackages | ForEach-Object {
+    npm install -g $_.name
+}
 
 Invoke-PesterTests -TestFile "Node"