[GhzGarage]

Removes the ~98 LogAssetRegistry: Warning: ... package was marked as deleted in editor, but has been modified on disk lines from MantleCore test runs. Item 4 of the build-warnings pass. No waits, and no expected-message hiding.

Mantle-PR: mantleplatform/mantle#320
(This PR changes no copied files. The line is only there because MantleCore main already carries #320's copies, and #320 hasn't merged into mantle main yet.)

Cause

AssetDeleted puts a package whose last asset goes into the asset registry's empty-package set. The change from the save just before reaches the registry a frame later, through the directory watcher, and finds the package in that set. AssetRegistry.cpp:8501 then warns and returns the package from queries again. Tests that save and then remove their assets hit this every run. Flushing the watcher first doesn't help: Windows hasn't delivered the save's change yet in that same frame.

Fix

• FMantleAssetCleanup::MoveAside(..., bDeleteFiles = true) now calls IAssetRegistry::PackageDeleted on each package after its file is gone, instead of AssetDeleted on each asset. That removes the registry data without the empty-package mark, so the late change has nothing to trip.
• UnloadPackagesClean keeps the file, so it no longer tells the registry the assets were deleted. The registry keeps what it found on disk.
• The hand-written "AssetDeleted, then delete the file" cleanups in six tests now go through MoveAside: WeaponBuilderV2, WeaponPublishParts, WeaponRigidMesh, WeaponBuilderExport, WeaponBuilderPanel and VehicleExportScale.

Testing

Run with D:\Mantle\mantle at #320's head (9da9c046b) plus this branch, headless with -nullrhi:

• Build: MantleEditor Win64 succeeded with 0 warnings.
• Tests: Mantle.Editor + Mantle.WeaponPublish.Parts + Mantle.Vehicle, 824/824 passed.
• Warning counts: "marked as deleted" lines went from 92 (in the earlier subset) and 6 (in tests outside it) to 0. Total LogAssetRegistry warnings: 0.
• The rebase onto main only added Copies from mantle #320 at 9da9c046b: copyright line on LuauWarnings.h #148, a comment line in LuauWarnings.h.

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