Move Azure Service Fabric unit-test binding redirects to active test/ project

[Copilot]

The review flagged that the added binding redirects were placed under the legacy Test/ tree, which is not referenced by DurableTask.sln. This update applies the same redirect configuration to the active unit test project under test/.

• Scope

  • Addresses only review comment #discussion_r3444200514.
  • No production code changes.

• What changed

  • Added test/DurableTask.AzureServiceFabric.Tests/App.config.
  • Included the binding redirects needed for the Azure Service Fabric unit test project (net48) in the active test path.

• Resulting alignment

  • Redirect config now sits with the test project actually included in solution builds/runs.

<!-- test/DurableTask.AzureServiceFabric.Tests/App.config -->
<dependentAssembly>
  <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
  <bindingRedirect oldVersion="0.0.0.0-13.0.0.0" newVersion="13.0.0.0" />
</dependentAssembly>