Upgrade yarn and cleanup npm commands (#10054)

* Add yarn.lock file for NodeServices
* Remove references to 'npm install' (causes double-download of node modules) and replace npm commands in package.json with yarn for consistency
* Upgrade yarn to 1.15.2

Author: natemcmaster

build/tasks/RepoTasks.csproj

@@ -14,7 +14,7 @@
     <PackageReference Remove="Internal.AspNetCore.Sdk" />
     <PackageReference Include="NuGet.Build.Tasks" Version="5.1.0-rtm.5921" />
     <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="2.1.0" />
-    <PackageReference Include="Yarn.MSBuild" Version="1.13.0" />
+    <PackageReference Include="Yarn.MSBuild" Version="1.15.2" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(BuildInstallers)' == 'true' AND '$(TargetOsName)' == 'win'">

global.json

@@ -3,7 +3,7 @@
     "version": "3.0.100-preview5-011568"
   },
   "msbuild-sdks": {
-    "Yarn.MSBuild": "1.13.0",
+    "Yarn.MSBuild": "1.15.2",
     "Microsoft.DotNet.Helix.Sdk": "2.0.0-beta.19253.2"
   }
 }

src/Components/Browser.JS/Microsoft.AspNetCore.Components.Browser.JS.npmproj

@@ -22,8 +22,8 @@
           Outputs="@(WebPackOutputs)">
     <RemoveDir Directories="dist" />
 
-    <Yarn Command="run build:debug" StandardOutputImportance="High" StandardErrorImportance="High" />
-    <Yarn Command="run build:production" StandardOutputImportance="High" StandardErrorImportance="High" />
+    <Yarn Command="run build:debug" />
+    <Yarn Command="run build:production" />
   </Target>
 
 </Project>

src/Middleware/CORS/test/FunctionalTests/CORS.FunctionalTests.npmproj

@@ -2,7 +2,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), Directory.Build.props))\Directory.Build.props" />
 
   <!--
-    This project file is present so the CI will run `npm install` on the package.json file.
+    This project file is present so the CI will run `yarn install` on the package.json file.
     The C# invokes node to start the tests.
   -->