Fix warning in Courtesy Push Pipeline: CFS0011 due to missing NuGet.config files (#21543)

* Adding NuGet.Config files

* Updating NuGet.Config files

* Deleted unncessary file

* Fixing the NuGet.config file and adding necessary packages in the feed in PipelineTools

* Changing the file location

* Minor changes

Author: surajitshil-03

NuGet.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="PipelineTools_PublicNugetFeed" value="https://pkgs.dev.azure.com/mseng/PipelineTools/_packaging/PipelineTools_PublicNugetFeed/nuget/v3/index.json" />
+  </packageSources>
+</configuration>