Add dry-run mode to BCU-console uninstall command

[hazeliscoding]

Fixes #947

Adds an opt-in /N switch (--dry-run also accepted) to the uninstall subcommand that previews the operation without making any changes:

• Runs the same application discovery and uninstall-list resolution as a real run.
• Prints each matched application with its uninstaller kind and the exact uninstall command line that would be executed (respecting /Q quiet-uninstaller selection).
• With /J=<Level>, also runs the junk scan and prints each junk item with its confidence that would be deleted at that level, with a note that pre-uninstall results may differ from the actual post-uninstall cleanup.
• Performs no registry writes, no file deletions, and no process kills, and skips all confirmation prompts, so it is safe for unattended/scripted use.
• Exits 0 on a successful preview, 1 if the list matches no applications.

Without the switch, behavior is unchanged.

[Klocman]

I think the existing simulation functionality should be used. BulkUninstallConfiguration takes a simulate parameter which will prevent actually uninstalling the application.

Instead of adding a completely separate code branch that acts differently from the real branch, the simulation mode should be included in RunUninstall.