use msft_consumption to ensure packages are retained

Author: dibarbet

CONTRIBUTING.md

@@ -41,4 +41,5 @@ To update the version of the roslyn server used by the extension do the followin
 1.  Find the the Roslyn signed build you want from [here](https://dnceng.visualstudio.com/internal/_build?definitionId=327&_a=summary).  Typically the latest successful build of main is fine.
 2.  In the official build stage, look for the `Publish Language Server Executables` step.  In there you will see it publishing the `Microsoft.CodeAnalysis.LanguageServer` package with some version, e.g. `4.6.0-3.23158.4`.  Take note of that version number.
 3.  In the [package.json](package.json) inside the `defaults` section update the `roslyn` key to point to the version number you found above in step 2.
-4.  Build and test the change (make sure to run `gulp installDependencies` to get the new version!).  If everything looks good, submit a PR.
+4.  Build and test the change (make sure to run `gulp installDependencies` to get the new version!).  If everything looks good, submit a PR.
+    * Adding new package versions might require authentication, run with the `--interactive` flag to login.  You may need to install [azure artifacts nuget credential provider](https://github.com/microsoft/artifacts-credprovider#installation-on-windows) to run interactive authentication.

server/NuGet.config

@@ -3,8 +3,7 @@
 <configuration>
   <packageSources>
     <clear />
-    <add key="vs-impl" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/vs-impl/nuget/v3/index.json" />
-    <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
+    <add key="msft_consumption" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/msft_consumption/nuget/v3/index.json" />
   </packageSources>
   <disabledPackageSources>
     <clear />