Address non-interactive MSIX uninstall 0x80070520 (#6579)

[Bearmancer]

📖 Description

When running winget uninstall <package> for an MSIX/Store package from a non-interactive session (Session 0: SSH, WinRM, background agent, CI), Deployment::RemovePackage calls PackageManager::RemovePackageAsync, which fails with 0x80070520 : A specified logon session does not exist. It may already have been terminated. — the AppX deployment broker requires an interactive logon session when the call is issued from a packaged context.

This change makes the MSIX uninstall path resilient in that situation:

• Deployment::RemovePackage now inspects the deployment result instead of unconditionally rethrowing. On ERROR_NO_SUCH_LOGON_SESSION it treats the removal as successful when the package is no longer registered for the user, and otherwise falls back to an unpackaged Remove-AppxPackage invocation (hidden window, bounded wait), re-checking registration afterwards.
• UninstallFlow no longer reports a false failure for 0x80070520 when the package family is not registered for the user; it logs the condition and continues.

🔗 References

Fixes #6579

🔍 Validation

• Added unit test: UninstallFlow_MSIXUninstall_NonInteractiveSessionNoError.
• Manual repro/verification steps: see winget uninstall of a Store/MSIX package fails with 0x80070520 in a non-interactive session #6579 (Session 0 shell, Store/MSIX package).

✅ Checklist

• Signed the Contributor License Agreement
• Linked to an issue
• Updated Release Notes (if applicable)
• Updated documentation (if applicable)
• Added or updated tests (or noted why not applicable)
• Updated Copilot instructions (if build, architecture, or conventions changed)

🤖 AI Assistance

• AI assistance was used and has been disclosed in this PR
• No AI assistance was used

📋 Issue Type

• Bug fix
• Feature
• Task

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