[Eng] Rename release feed from "azure-powershell-onebranch" to "azure-powershell-prod" (#25824)

* add script for nuget auth

* update

* rename feed from azure-powershell-onebranch to azure-powershell-prod

Author: VeryEarly

tools/NugetAuth/OneBranchNuget.Config

@@ -3,7 +3,7 @@
   <packageSources>
     <clear />
     <!-- Do not add any additional feeds if new packages are needed they need to come from nuget.org or our azure-sdk-for-net DevOps feed -->
-    <add key="azure-powershell-onebranch" value="https://pkgs.dev.azure.com/azclitools/public/_packaging/azure-powershell-onebranch/nuget/v3/index.json" />
+    <add key="azure-powershell-prod" value="https://pkgs.dev.azure.com/azclitools/public/_packaging/azure-powershell-prod/nuget/v3/index.json" />
   </packageSources>
   <disabledPackageSources>
     <clear />