Add QA evidence + smoke test for Welcome NewFile

[tjp420]

Added QA evidence and smoke test for Welcome NewFile. The smoke script (Tools/ci/smoke_welcome_newfile.ps1) runs after starting the app with diagnostics enabled, verifying that the necessary log lines appear. Also added a PR workflow '.github/workflows/smoke_welcome.yml' that builds the solution, starts the app with diagnostics on Windows, and runs the smoke script.

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