Stop publishing test framework to dev feed (Azure#49677)

Author: JoshLove-msft

sdk/core/Azure.Core.TestFramework/src/Azure.Core.TestFramework.csproj

@@ -2,7 +2,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(RequiredTargetFrameworks);net47</TargetFrameworks>
     <IncludeOperationsSharedSource>true</IncludeOperationsSharedSource>
-    <IsPackable>true</IsPackable>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Azure.Core" />

sdk/core/ci.yml

@@ -66,9 +66,6 @@ extends:
       safeName: AzureCoreAmqp
     - name: System.ClientModel
       safeName: SystemClientModel
-    - name: Azure.Core.TestFramework
-      safeName: AzureCoreTestFramework
-      skipReleaseStage: true
     CheckAOTCompat: true
     AOTTestInputs:
     - ArtifactName: Azure.Core