Fixup feeds (#48065)

Co-authored-by: Matt Mitchell <mmitche@microsoft.com>

Author: dotnet-bot

NuGet.config

@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <!-- Don't use any higher level config files.
        Our builds need to be isolated from user/machine state -->
@@ -11,7 +12,7 @@
       one as a template. The following line is a marker to insert the test restore sources.
     -->
     <!-- TEST_RESTORE_SOURCES_INSERTION_LINE -->
-    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
     <add key="dotnet-tools" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json" />
     <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />
     <add key="dotnet5" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json" />
@@ -24,4 +25,4 @@
   <disabledPackageSources>
     <clear />
   </disabledPackageSources>
-</configuration>
+</configuration>

src/libraries/pkg/test/packageTest.targets

@@ -8,7 +8,7 @@
     <ToolsDir>$(MSBuildThisFileDirectory)tools\</ToolsDir>
 
     <RestoreSources>
-      https://api.nuget.org/v3/index.json;
+      https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json;
       https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json;
       https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet6/nuget/v3/index.json;
       https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet6-transport/nuget/v3/index.json;

src/tests/sizeondisk/sodbench/SoDBench.cs

@@ -155,9 +155,8 @@ class Program
         @"<?xml version='1.0' encoding='utf-8'?>
         <configuration>
         <packageSources>
-            <add key='nuget.org' value='https://api.nuget.org/v3/index.json' protocolVersion='3' />
-            <add key='myget.org/dotnet-core' value='https://dotnet.myget.org/F/dotnet-core/api/v3/index.json' protocolVersion='3' />
-            <add key='myget.org/aspnet-core' value='https://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json' protocolVersion='3' />
+            <add key='dotnet-public' value='https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json' protocolVersion='3' />
+            <add key='myget-legacy' value='https://pkgs.dev.azure.com/dnceng/public/_packaging/myget-legacy/nuget/v3/index.json' protocolVersion='3' />
         </packageSources>
         </configuration>";