[Installer] Fix uninstall failure when cached MSI is missing

[giruuuuj]

��This PR fixes the 'msi file for v0.86 not found' error during uninstall (issue #48668). When Windows Installer cache is cleaned, the cached MSI file for a previous PowerToys version may be missing, causing uninstall to fail.

Root cause: The ForceRemoveOldVersion custom action only ran during upgrades (WIX_UPGRADE_DETECTED), not during pure uninstall.

Changes:

1. Product.wxs � Schedule ForceRemoveOldVersion to run during pure uninstall as well:

   • During upgrades: before RemoveExistingProducts (unchanged)
   • During uninstall: before RemoveFiles (Installed AND (REMOVE="ALL") AND (NOT WIX_UPGRADE_DETECTED))

2. CustomAction.cpp � ForceRemoveOldVersionCA improvements:

   • Get the current product code via MsiGetPropertyW to skip it during enumeration (avoids re-entrancy)
   • For orphaned products with missing cached MSI, force-remove using MsiConfigureProductExW with MSIFASTINSTALL=7 REMOVE=ALL

3. CustomAction.def � Export ForceRemoveOldVersionCA

4. force_remove_orphaned_msi.cmd � New standalone cleanup script for detecting and force-removing orphaned PowerToys MSI products with missing cached files

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entrancy
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[Rr]e[- ]entrancy

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